Postby silvermakersmarks » Fri Jul 12, 2019 10:03 am
I can confirm that the assay year is 1929/30 and that we can definitely rule out Richard Rew, Richard Rugg and Robert Rutland who were all London-based and working at a completely different time.
There is no published evidence that the Sheffield manufacturer Richard Richardson used the Birmingham Assay Office but a so-far unidentified RR mark has been noted with Birmingham hallmarks dating from the 1890s until the 1930s. These dates coincide with Richardson's Sheffield dates so he is certainly a possibility.
Phil