US 6-cent airmail stamp value: identify the common designs

A six-cent denomination is not one issue

This guide covers common United States six-cent airmail designs issued between 1938 and 1949. It is not a price list for every American airmail stamp. Start with the picture and inscription, then identify the physical format. A red aircraft, a two-color eagle and a town anniversary stamp can all say six cents while belonging to different catalog entries.[1][2][3]

If your stamp shows the early Curtiss Jenny design, use the separate 1918 Curtiss Jenny guide. Its pricing is outside this article. A Zeppelin also needs its own US Graf Zeppelin comparison. Neither an aircraft subject nor an AIR MAIL inscription makes those issues comparable with the later ordinary stamps below.

The printed denomination tells you the original postal amount, not what a collector will pay. For this group, a useful description is more valuable than an exciting but unqualified number. Keep one loose stamp separate in your notes from a connected pair, booklet pane, plate block or complete envelope. The unit is part of the identification.

The blue-and-red eagle is the 1938 C23

Look for a red eagle carrying a shield inside a dark-blue frame, AIR MAIL across the top and 6-cent values at the lower corners. This is the distinctive two-color design cataloged as Scott C23. Mystic gives May 14, 1938 as its issue date, flat-plate printing and perforation 11. The real scan below shows the design rather than a generated imitation.[1][9]

The eagle is not a transport airplane seen at an odd angle. A faded red center can make a poor photo confusing, so read the lettering and compare the entire frame. The scan can establish the visible subject and layout. It cannot show your stamp's back, certify original gum, or prove a particular grade.

Mystic connects this issue with National Airmail Week and a design idea sketched by Franklin Roosevelt. That history helps explain the eagle, but it does not price every surviving copy as presidential memorabilia. Keep the design history separate from the dealer's actual description of the item being sold.[1]

Separate the 1941 transport from the 1949 DC-4

The carmine six-cent twin-motored transport is Scott C25, issued June 25, 1941. Mystic records rotary printing and perforation 11 × 10½. The DC-4 Skymaster sheet stamp, C39, followed on January 18, 1949 and has a four-engine aircraft. Its stated perforation is 10½ × 11, the reverse order. Do not let the shared red color erase that difference.[2][3]

First compare the aircraft and design proportions in a reference. Then measure the top or bottom perforations and the sides separately. The numbers describe a gauge, not a count of every tooth around the stamp. The perforation measurement guide explains the method. A photograph with clipped edges cannot settle a format question.

Read the denomination as well. Mystic's DC-4 account also discusses earlier five-cent stamps, and a similar aircraft does not make a five-cent issue a six-cent C39. Record the amount you actually see before copying a catalog number from a search result. A source page can describe several related issues even when its product title names only one.[3]

Alexandria and the Wright brothers are different designs

The 1949 Alexandria stamp is Scott C40. Instead of a large airplane it has the John Carlyle house and Gadsby's Tavern with the city seal between them. Mystic dates it May 11, 1949 and identifies the founding bicentennial. Buildings and a town seal are a direct reason to leave the transport-plane branch of your search.[4]

The Wright brothers issue, C45, dates to December 17, 1949. Its inscription and early-flight subject distinguish it from both the DC-4 and Alexandria. Mystic identifies it as magenta and perforated 11 × 10½. Eagle lists this issue separately from the later 1953 powered-flight stamp. Do not identify either one from the word Wright alone.[6][10]

Use the table below only after this design sorting. An Alexandria single is not a whole commemorative set, and the price of a Wright stamp does not establish the price of a Skymaster. These distinctions are small enough to check before spending money on a specialist opinion.

Check the DC-4 edges before calling it a coil

Stamp Smarter distinguishes the C39 regular sheet stamp, C39a six-stamp booklet pane and C41 coil. C41 has gauge 10 perforations horizontally. For physical inspection, that means perforations across the top and bottom and smooth left and right sides. Keep a vertical pair connected if present. Do not confuse the direction of the perforation line with the direction of the connected strip.[5][8]

Mystic's C41 page calls it a horizontal coil while giving horizontal perforations. This guide uses the unambiguous edge description rather than relying on that label. Stamp Smarter independently confirms the horizontal gauge and the booklet count. A trimmed sheet stamp can also have straight sides, so smooth edges alone do not authenticate C41.[5][8]

For C39a, preserve all six stamps and the attached tab if it survives. Eagle explicitly prices a pane with a tab and slight toning differently from a pane without a tab. A detached stamp does not retain the completeness of either pane. Never cut a margin or separate a pair just to make it resemble a single online.

Use a photo check after matching the design

Photograph the whole front squarely, including every edge. Add the back without touching unused gum. If you have a pane, block or envelope, photograph the complete object as well as the individual design. The wider view may explain a straight edge or retain the plate number that a tight crop would hide.

A photo check can suggest an issue and help organize the next reference search. It cannot authenticate a coil made by trimming, certify never-hinged gum or establish a hidden fault. Save the catalog publisher and number as provisional until the physical evidence agrees. The catalog-number workflow keeps that research traceable.

Exact dealer asks checked on October 17, 2026

Every amount below is an original USD retail ask. Mystic's selected Mint Stamp(s) radio option, stock code and product currency were checked together. Its mint wording is not upgraded here to never hinged. Eagle's list defaults to mint, never hinged, VF to XF unless the row says otherwise. Its C39 single instead says F+, and its two panes have explicit qualifications.[1][2][3]

Eagle's page says it was last updated March 16, 2026. The observation date below is the day it was retrieved, not a claim that the dealer revised prices that day. Its ordering terms require US funds and say availability and the total are confirmed by email. The listed amounts exclude shipping and do not prove that a particular specimen remains in stock.[6][7]

Why these offers do not set your selling price

The two C39 single asks are not equivalent grades or guaranteed realizations. One listing specifies F+ centering; the other selected option simply says mint. A higher retail price does not prove a rarer printing, and a lower one does not establish a dealer buying rate. Compare the words attached to the amount before comparing the amount itself.[3][6]

The USD 1.00 C39a pane has six stamps, an attached tab and slight toning. The USD 2.00 pane lacks the tab but has a different stated grade. This pair of offers does not demonstrate a universal tab premium or discount. Multiple characteristics changed at once. It certainly does not price one loose booklet stamp at either whole-pane amount.[6]

No completed-sale evidence was verified for this table, and no purchase or seller contact was attempted. If you want to sell a group, request an offer for that group and record it separately. Retail sorting and fulfillment are part of a dealer's business. A modest listed amount is not a promise that an individual duplicate will attract a buyer.

Condition, plate margins and covers need their own notes

Check missing perforations, tears, creases, thin spots, stains and gum disturbance. On the two-color eagle, a clear front is useful for identification but does not establish untouched gum. On the red aircraft stamps, a cancellation can hide the detail you need to separate the designs. Take another neutral-light photograph rather than guessing from a dark thumbnail.

For connected material, record weakened joins and any folded margin. A plate block needs its identifying margin, not just a group of stamps with the right count. Do not transfer a single-stamp ask to a numbered block without finding the same format. Keep faults visible in the record. The condition guide separates centering language from physical damage.

Leave stamps on their envelopes while researching. A dated airmail cover, a first-day item and an ordinary loose used stamp are different objects. The route, markings and full envelope may be relevant even when the adhesive is ordinary. This table contains no cover prices, so it cannot settle the value of an intact postal-history item.

Make a useful record without inventing a rarity

Write down the visible design, six-cent denomination, provisional Scott number, edge pattern and connected quantity. For an unused item, add only the gum observations you can actually make. For a cover, save front and back photographs and the cancellation date. Leave uncertain fields open rather than borrowing a dealer's grade from a representative picture.

Attach the closest table row with its source and observation date. Mark a mismatch in format or condition. If a supposed coil has cut edges, keep it unchanged and ask for a second opinion before paying for certification. An accurate common-stamp identification is a useful result. Nothing in these ordinary offers supports treating every six-cent airmail as an expensive error.

Frequently asked questions