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Mark TM116 should measure 1 1/2 X 2 5/8 (as you probably know), best thing to check it with is a digital caliper. They are pretty cheap to buy and give you .0001 of an inch so you can measure more accurately.
If it would measure 2.620 then you are ok but it seems like its off .100 which would validate your assumption of it being trim would be correct.
Nice card in any event....