I was cleaning out the case that my Francais casket lenses came in and underneath the bottom of the upholstery in the case was a small brown leather case with Waterhouse stops from "J.H. Dallmeyer Optican London". There are 6 stops ranging from 7.5 up to 100. They are 35mm wide. The serial number 48076 is engraved on one of the stops. Are these stops lens specific? I don't have any lenses that use these so I am not sure.
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