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Hi Kurt,
I thought the Royal portables were serial numbered in sequence and a letter-suffix referred to a model name. But I am not sure as I do not follow Royal machines in the 1930 to mid-1940's, much.
Do you know the "feature differences" between the Signet and the Mercury models in the 1930's to 1940's time frame ?
For example...which had or did not have a bell, which had bi-chrome ribbon, which had a "magic" left-margin, etc. ???
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