Pete,
1. I am not sure. From my observations, they are found on BUG proofed 1902 and 1906 models (obviously also on 1900 models as well, as George's example verifies)
2. They are not British proof marks...they are just conventional markings for the time, something like a standard (precursor to SAE or ISO9000?!!) intended for the international market.
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If it's made after 1918...it's a reproduction
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