I've emailed a request for any information about whether these could be the initials of this Italian gunsmithing outfit listed as:
Quote:
PATRO di Palama Roberto
Verdello 1976
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Also, many Italian 1851 reveolvers were imported by Richland Arms of Michigan during that time period, and there were some smaller Italian gunsmithing outfits building and assembling C&B revolvers back then.