Doug, your stereo images are really fascinating! When I look at the Athens tetradrachm, in the left image (reverse) the test cut appears as a protrusion rather than a gouge.
When you have the chance, please take a photo of the pop-out profile & post it. I had this set of repousse coins but only kept one example for my personal collection.
You might say that these repousse coins are simply coins with post mint damage. There was a US patent issued about 100 years ago that describes embossing a struck coin so that it appears to have the main device protruding from the surface. Here are some Weblinks describing the process & coins. https://www.cointalk.com/threads/em...-forward-whats-the-story.210972/#post-1501612 http://www.treasurenet.com/forums/w...r-coin-repousse-punch-pressed-pop-out-3d.html http://www.coinbooks.org/esylum_v14n45a03.html https://blackmountaincoins.cybrhost.com/p/BMC/c-COIN-ART/1915_EXO_12537.html I traded my repousse coin set for a single “primo” example of the encased postage stamp. The repousse coins were pretty but the US postage stamp coin is dripping with history. Here is the encased stamp:
my pop out coins are in this thread: https://www.cointalk.com/threads/repousee-coins-aka-push-outs-or-pop-outs.225062/
I just cross one eye, a technique perfected while bored silly in the 5th grade. Who knew it would some day come in handy? Since you can only cross your eyes while looking at your nose, try this. Look at your nose while holding your finger a foot or so in front of your face. Your finger will be doubled. Shift your gaze to the finger, trying to do so with your dominant eye. If you can leave your nondominant eye relaxed, you'll still see two fingers; your eyes will be "crossed". If that doesn't work, do the nose-look/finger thing but once focused on your nose, close your nondominant eye, keep it relaxed, move your open eye's gaze to the finger, then open the closed eye. Your gaze will probably still be crossed but you may have to work to keep it that way. Once you can do that, try the same technique but with the Doug's images instead of your finger.