Little known "secret" in US Philatelics - Something Fun for the Holidays
The USPS is oft criticized for it's terrible service and slow processing (and never more so than at current, with the holiday package shipping season on in the midst of the Covid Pandemic). So I thought I'd try to lighten the atmosphere a bit, and shine a spotlight on a little known area of history in the USPS the "Stamp Decoder".
Starting in 1999 with Scott #3036, and continuing through to 2004 with Scott #3862, they issued 42 (another favorite and magical number) of these stamps. Scott Catalog states: Beginning with Nos. 3036 and 3036a, hidden 3-D images can be seen on some stamps when they are viewed with a special "Stamp Decoder" lens sold by the USPS. Stamps with 3-D images are 3036-3036a, 3167, 3168-3172, 3178, 3206, 3230-3234, 3238-3242, 3261-3262, 3321-3324, 3472-3473, 3647-3648, 3651, 3771, 37897-3791, 3808-3811, 3838 and 3862.
So if you have any of these issues, and a USPS Stamp Decoder, you can see the magic. Here is an example of the 2002 issued #3651 "Houdini" stamp, as seen with the naked eye:

And here is is "Decoded"

You can see the "Chains" in Houdini's jacket.
The decoder is plastic, and looks like this:

I thought about putting this in the Philatelic Eye Candy thread, but decided this was weird and special enough it deserved it's own writeup.
Happy holidays every!
Starting in 1999 with Scott #3036, and continuing through to 2004 with Scott #3862, they issued 42 (another favorite and magical number) of these stamps. Scott Catalog states: Beginning with Nos. 3036 and 3036a, hidden 3-D images can be seen on some stamps when they are viewed with a special "Stamp Decoder" lens sold by the USPS. Stamps with 3-D images are 3036-3036a, 3167, 3168-3172, 3178, 3206, 3230-3234, 3238-3242, 3261-3262, 3321-3324, 3472-3473, 3647-3648, 3651, 3771, 37897-3791, 3808-3811, 3838 and 3862.
So if you have any of these issues, and a USPS Stamp Decoder, you can see the magic. Here is an example of the 2002 issued #3651 "Houdini" stamp, as seen with the naked eye:

And here is is "Decoded"

You can see the "Chains" in Houdini's jacket.
The decoder is plastic, and looks like this:

I thought about putting this in the Philatelic Eye Candy thread, but decided this was weird and special enough it deserved it's own writeup.
Happy holidays every!
Comments
And -- Happy Holidays to all, too
-S
United States Postal Service
November 12, 1997
Stamp News Release Number 97-096
The Mars Pathfinder stamp is the third U.S. stamp subject to incorporate hidden images to prevent counterfeiting, while adding an interesting design element. The hidden text -- Mars Pathfinder, July 4, 1997 and the letters USPS --is not visible to the naked eye but can be viewed by using a decoder lens, which is available through the Postal Service's Philatelic Fulfillment Center in Kansas City, MO. The U.S. Air Force and Classic Movie Monsters stamps issued earlier this year also feature hidden images.
I did a search of the site using both "Stamp Decoder" and "Decoder" and found only one match, that being for a $1 fox stamp from the USPS. This is apparently one of the stamps with a secret image that can only be seen with the decoder.
The seller has an image of the stamp seen through the decoder to show secret image if anyone is interested.
Sorry for the confusion.
The cast (in order of appearance):
1997, Sep 18: Scott Nr 3167 US Air Force Thunderbirds
1997, Sep 30: 3168-72 Classic Movie Monsters
1997, Dec 10: 3178b Mars Pathfinder
1998, May 29: 3206 Wisconsin Statehood
1998, Aug 14: 3036 Red Fox
1998, Aug 20: 3230-34 Bright Eyes
1998, Oct 1: 3238-42 Space Discovery
1998, Nov 19: 3261 $3.20 Space Shuttle Endeavor
1998, Nov 19: 3262 $11.75 Spaace Shuttle on Boeing
1999, Jun 25: 3321-24 X-treme Sports
2001, Jan 29: 3472 $3.50 Capitol Dome
2001, Jan 29: 3473 $12.25 Washington Monument
2002, Jul 3: 3651 Houdini
2002, Jul 30: 3647 $3.85 Jefferson Memorial
2002, Jul 30: 3648 $13.65 Capitol Dome
2003, Feb 13: Special Olympics
2003, Jun 13: 3787-91 Lighthouses
2003, Aug 8: 3808-11 Football Heroes
2004, Apr 1: 3838 USAF Academy
2004, May 29: 3862 Nat'l WWII Memorial