Hi Everyone

First post but I hope you can all help. I purchased a 300mm F6.3 Komura lens mounted on a Copal 1 shutter in a Technica board. The ring which held the shutter in the board was not a standard item and looked to be something the seller had lying around. However the good news is it is a perfect spacer for me to mount it in an adapted Horseman VH board. The question is does anyone know what it is and more to the point where I could get another one as I have another Copal 1 shutter lens to mount in another board. Its a stepped ring with the correct thread for a Copal 1. There are no other threads. There are 4 very small (1.5mm - 2mm) holes in the outer ring. The only text says 'C-1' and 'Made in Japan'. An extensive Google brought up nothing. Pictures attached. Please ignore the aluminium as I have removed the black paint.

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Much appreciated for all your help and thanks in advance

APA