This is the possible fourth die variety I found in the mixed world coin bag (See 1935 Argentina DDO post).
This might be a stretch, but there may be a partial 0 to the right of the 1 in the date. The die abrasion to the neck makes me think that it is an overdate that was partially abraded away. Then again, it could easily just be a die gouge. I can't find any high quality pics of 1950 or 1951 online so I could only make an overlay with a very blurry image, looks close but can't tell for sure.
I won't list this one until I know if an overdate is even possible on this date/denomination.
Just did a bit of searching around, and there are multiple overdates known on the 1960 Peru Gold 100 Soles (1960/59). So an overdate is definitely possible on a 1951 Peruvian coin.
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