David, welcome to the forum. You have posted in the correct place.
If it's marked 1937, it's a Mauser. I believe this was the year that the finishing process changed from all the slow hand work of rust bluing, to hot salt bluing in big batches. Depending on whether early or late '37, it will either have strawed small parts, or they will be salt blued along with the rest of the gun. The 'Mauser hump" also figures in somewhere in this period, but I'm not sure of the date it was phased in.
Best to post some close, clear pics to optimize the "remote-control" analysis available here.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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