Here is the jaw set that I have for the Marchant 12A - also fits the 4A, 6A and the 6FG.
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Since there is enough interest I will stick them up on Ebay.
https://www.ebay.com/itm/302705007140
I also have some small jaw sets for the older 6F machines ... (that Marchant sneers at as "those old cheap machines" ...) - used by US Navy and Air Force.