I don't have a vernier, but the 3s is 56mm, the 3 58mm both of these measurements match the s.k. grimes specs, the front lens cell measures 67mm ??
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Since you say that the cells won't fit into either of these shutters, we'll need the measurements of the threaded part of the lens cells. Then someone could figure out which shutter(s) they'll fit.
Kumar
I have seen 360mm Congo lenses in a barrel mount for sale on Ebay. Is it possible that Congo made lenses in a barrel with different thread sizes than would fit in a standard shutter size?
I have a couple of Congo 210mm lenses in barrel. The cells have 54.5mm threads, which will not fit into any shutter I have (and I have a few!)
Kumar
I'm afraid I can't recall any shutter that has a 67mm thread. Perhaps someone else knows more?
Kumar
Not what you want to hear, but fair advice none the less. Either fit a Packard behind it and learn how to work with 1/20th second or longer exposures, or take good images of it and put it on Ebay. It's not a terribly valuable lens, and there are plenty of 360 Osaka lenses in fine working shutters for not much money. Sell yours and buy one of those. You'll be money and grief to the good.
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I did my research prior to purchasing this lens, by all reports it should have fitted into a copal 3, of course with the lack of documentation on line there is no way of being certain. Is still good on my studio and 10x12 field using the speed graphic curtain shutter