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Posted By: Dave

I'm not 100% certain, and I don't have any books with me, but I think the T210 size is identical to T206, nominally 1.4375 (1 and 7/16) by 2.625 (2 and 5/8) inches.

I made a composit of two cards, a T206 that is exactly the nominal height (+/- 0.001 inch) and the T210 was chosen at random from the few I have.

You probably can't tell from the resolution of this scan, but the top margins have been set the same, and the T210 is slightly taller than this card, but not by much. It's about 1/4 the height of the letters at the bottom of the T206, so I'll guess about 0.020 taller for the T210.

This is just a single sample, but I'd bet they are nominally the same.