Originally Posted by xkaes
Your statement -- "WS : S = Seiko." -- is too broad, as I pointed out. Only the short W S lenses were sold with Seiko shutters. The longer length W S lenses were sold with Copal shutters -- and were not marked W C. So how does "WS = Seiko" when the shutter is a Copal?
I think it is clear there was an empiric observation the 180mm WS only fits a Seiko shutter. S = Seiko. See post #14.
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