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Hi Stephen65. I know that this is a long time interval since your original post, however, it might be of use. I am a researcher of the flatware pattern 'Fiddle Thread & Shell' and of course RC was a silversmith. I have read the comments above. The following reference will be worth your while to follow up.
http://www.schredds.com/pursuivant/crossley.htm
It should help paint a more colourful picture and perhaps give some additional leads. GOOD hunting, Christian