I'm putting together a virtual museum for Powder Puff Derby material.
Here's a cachet from 1966, sold to raise funds for the Powder Puff Derby.
Here's what the card says:
The Powder Puff Derby this year marks a significant achievement-the only aviation event to function for 20 consecutive years...a race run by women for women. We are proud of its success and its contribution to general aviation.
During this 20 year period, with our first race numbering all of 2 entries, we have totaled 1009 entries, 3,382,746 race miles, and 73 cities in these United States have served as official stops, some as many as 8 times.
This year we anticipate another exciting race from the Evergreen State of Washington to the Sunshine State of Florida. In purchasing this cachet, you have supported the POWDER PUFF DERBY.
What's a cachet?
In philately, a cachet is a printed or stamped design or inscription, other than a cancellation or pre-printed postage, on an envelope, postcard, or postal card to commemorate a postal or philatelic event. There are official and private (independent of postal authorities) cachets. They commemorate everything from the first flight on a particular route, to the Super Bowl. Cachets are also frequently made, either by private companies or a government, for first day of issue stamp events or "second-day" stamp events. They are often present on event covers.
The first cacheted FDC (first day cover) was produced by prominent philatelist and cachet maker George Ward Linn in 1923, for the Harding Memorial stamp issue.
Cachet-making is considered an art form, and cachets may be produced by using any number of methods, including drawing or painting directly onto the envelope, serigraphy, block printing, lithography, engraving, laser printing, attachment of photographs or other paper memorabilia, etc. Frequently flight cachets (which have also been used in space and on the moon) are rubber-stamped.
The largest and best-known cachet-making companies, which typically produce thousands or tens of thousands of printed cachets for U.S. stamp issues, are Artcraft, Artmaster, Fleetwood, House of Farnam, and Colorano.