recently got a cheap seiko sumo. I wonder if anyone can tell me the dial size of it? I'm looking at different dialparts from 10watches that fit with the 6r15 movement but no idea if the size of 28.5mm will fit the sumo.
I've moved your query to the main watchmaking and tinkering forum, where it might be better seen. Unfortunately I don't have the information you desire, but best of luck in your search! The quickest way might be to open the watch and measure the dial with calipers?
Anything in the 7s26 4 o'clock crown section will fit and dial feet will be in the right place. Obviously date only or no date dials unless you transplant a day wheel and other parts from a 7s26 to the 6r15.