What size C&P has a 20” ink plate?

Trying to figure out what size a press is before going to look at it, but only have the size of the inking disc.

Any ideas?

I’ll measure mine tomorrow, but I think it’s a 12x18.

Thanks so much.
My 8x12 is only 14, so I figure it must be at least that size.

yep, it’s the 12 x 18!

Thank you!