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Backwards R Hallmark

Does anyone in the group know this hallmark? The R is backwards and it’s stamped 6 times on the base and handle of a cruet set. The sterling on the glass bottles are all marked for Charles Thomas Fox, English 1840. The set seems to be a marriage with the bottles and not original.

Interestingly the whole mark is backwards - I have not seen this before and have no explanation for how this came about. In addition the large R is normally RD (D written as a superscript); I think that I may have seen this variation but I can’t be sure.


It is a British design registration mark (see British Registry Date Numbers - at Here we see that the design was registered on 10 January 1871 so it cannot have been made before then.