Beverage and Jarvis were the photographers Directly opposite the Post Office in Marshalltown Iowa.More than likely Roy is related to Charlie Clark Photo Number 1537
I will guess that this CdV is from the 1870’s give or take a few years.
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Update from Iggy:
I think this is Roy Perry Clark, (6 Jul 1875 in Iowa - 20 Jan 1958 in Los Angeles) the son of Perry J. and Hannah E. Clark. Perry J. Clark was Ellis Clark's brother. Charles (Photo Number 1537) would have been Roy's cousin.
Roy Clark was a Court Clerk in LA and not the singer on TV's "Heehaw."
Roy and his wife Charlotte Hartley had a son named Perry Joseph Clark