~~~ I can imagine the "50" of the series is a product of a "reworked" MOP due to its defined, unusual shape...

...and here we have a well-worn example of a plaque in which its complete inventory was returned (repurchased?) to CARO for refinishing and found on property at CARO not too long ago by Serge in Paris, who first explained the process to Donald L. as it was explained to him at CARO.

Those which you illustrate are beautiful examples.