1916 Jenny Invert Trial Color Proofs Value & Price Guide

Before the famous 24-cent Inverted Jenny stamp of 1918 became the most celebrated error in American philately, the Bureau of Engraving and Printing was already experimenting with bicolor airmail stamp designs using the Curtiss JN-4 airplane image. Trial color proofs from 1916 and the surrounding development period represent the earliest stages of what would eventually become the most valuable stamp error in the world. These proofs, printed in experimental color combinations to test visual impact and printing viability, are among the rarest philatelic items from the pre-airmail era.

The Curtiss JN-4, universally known as the "Jenny," was the primary training aircraft used by the United States military during World War I. More than 6,000 were built. When the Post Office Department decided to create stamps for the new airmail service, the Jenny was the natural choice.

Quick Value Summary

• Item: Jenny Invert Trial Color Proofs (Pre-1918 experimental prints)

• Year: 1916-1918 development period

• Category: Stamps

• Condition Range:

  • Trial color proofs on India paper: $5,000 - $30,000
  • Die proofs in final colors: $10,000 - $50,000
  • Plate proofs in experimental colors: $3,000 - $15,000
  • The actual 1918 Inverted Jenny (C3a) for reference: $200,000 - $1,600,000+

• Rarity: Extremely Rare. Most exist in fewer than 10 examples

The Story

The Bureau needed a bicolor stamp requiring two passes through the press: once for the frame, once for the vignette. This two-pass process created the opportunity for the inversion error. But before production, extensive testing was needed.

Trial color proofs tested various color combinations for visual contrast, ink adhesion, and printing clarity. Some show the Jenny in colors never used for the final stamp. Others test different frame colors.

The Inverted Jenny itself (Scott C3a) was created on May 10, 1918, when a single sheet of 100 stamps was printed with the airplane upside down. William T. Robey purchased that sheet at a Washington D.C. post office for $24, then sold it for $15,000 within a week. Today each of the approximately 95 surviving Inverted Jennys is worth $200,000 to $1,600,000.

The trial color proofs are a different collecting niche, appealing to specialists who collect development history.

How to Identify Them

• Die Proofs: Printed directly from engraved die onto India paper or card. Most valuable form

• Plate Proofs: From finished plate but in non-standard colors

• Trial Color Proofs: Specifically printed in non-standard colors

Key Points:

• Printed on India paper (thin, translucent) or card stock

• Colors differ from issued 24-cent stamp (red frame, blue vignette)

• No gum (not intended for postal use)

• Imperforate

• May bear Bureau approval stamps or notations

Common Confusions:

• Modern color proof reproductions are not genuine

• The 1918 Inverted Jenny (C3a) is the actual error stamp, not a trial proof

• 2013 commemorative Inverted Jenny stamps are modern issues

Value Factors

• Type: Die proofs most valuable, then plate proofs

• Color Rarity: Non-issued colors more desirable

• Condition: Clean, undamaged proofs with full margins command premiums

• Provenance: Documented ownership history adds significant value

• Certification: Expert certification from Philatelic Foundation or American Philatelic Expertizing Service essential

Authentication

• Expert Certification Required for every trial color proof

• Paper Analysis: Genuine proofs use specific period-appropriate paper

• Printing Characteristics: Engraving quality and ink formulation must match Bureau methods

Where to Sell

• Robert A. Siegel Auction Galleries: Premier U.S. stamp auctioneer

• Heritage Auctions: Strong philatelic department

• Daniel F. Kelleher Auctions: Major stamp auctioneer with proof expertise

Estimated Selling Costs:

• Expert certification: $50-$200+

• Auction commission: 15%-20%

• Insured shipping: $30-$100

Not sure about the condition of yours? Upload a photo to Curio Comp for a quick AI-powered estimate.

Explore More

The Jenny Invert trial color proofs are the behind-the-scenes story of America's most famous stamp error. Before the printing press produced that single inverted sheet on May 10, 1918, these proofs recorded every step of the design process. Browse all Stamps items ->

Related Items