On the wrist today is a 6306 (6306-704L T is the precise text under the 6 marker) with a “Suwa dial” (indicating the watch was made in the Seiko Suwa factory in Japan). I think this text was seen only on the “Suwa dials” but I’m not certain. This referenc...
The outer dials don't have the mark but the sealed inner one does. Maybe replacement dials came from Suwa? The faded one on the right might be an aftermarket dial, as it has no markings at the bottom. Mike ...
I think the Suwa dials were standard on the Japanese domestic market watches (the ref 6306) which was only in existence for maybe 4 years based on what I've read (76-80). [This could be incorrect, if someone knows please correct me]. By contrast the 6309 ...
The dial I assume says "Movement and Dial Japan Cased Hong Kong" at the bottom, it looks like that could be the case from your picture but hard to read.