Pin Finder recomendation?

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Did you try from both "sides" of the pin? If one is missing, you would have to measure down one property line and make a slight arc measurement, then go to the other pin, measure back up and where your marks intersect is where the pin belongs. To verify, pick an adjoining neighbors line with their permission and follow their adjoining line measurement from their pin.
I have surveyed out up to 25 acre parcels, and have found everything from USGS benchmarks to rotted wooden stakes used as pins in the process, guess I am just persistent. I also use County records for my measurement reference.

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