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What year? I feel like they were making those about the same time as my King Seiko, just different factories if I remember my history. The King Seiko's were made at the Daini factory and the Grand Seiko at the Suwa. They were competing with each other. Mine is S/N 9D so 1969 December.
Yep, August 1969 on this one. The movements are extremely similar. All 45XX are I guess. It all started with the Lord Marvel 36000 which was the proof of concept 36000 bph movement.
The only other vintage 36000 bph are all autos and don't have a no date version - 6145/6146, the more accurate 6155/6156 and the ultimate VFA 6185/6186 - super expensive.
Btw there are 6146 watches in HSS - hardened steel. Also I think there are some exotic 6185/6186 cases.
There are also ladies movements which are 36000 bph btw - 1944 and 1964. I think they are very nice for ladies.
Anyway as far as all of these go - my grails are 6186 and the elusive 4580.
I don't have any 61 though. Just a bunch of 45XX. Sadly no 4580 either.
Btw your 4502 is nice, minty condition just like I like it.
Speaking of King Seikos, here is my 45KS no-date. I recently had it serviced and my watchmaker mentioned that it’s one of the most accurate vintage watches he’s worked on. Although I don’t wear it frequently, it rarely loses a second over a two-day period. Great movement!
Your medallion is in awesome shape
A little Kamen Rider lume, as I miss my connie, in having the crown replaced