With that amount of wear and dirt I'd say BV. Need to see both sides though, before giving a value.
edited to add: Decided to look this up just in case my foot was in my mouth. You have a San Louis Potosi example, KM #377.12, 0.903 Ag 0.7859 oz ASW. There's only one variety listed - an 1876/5 overdate - which I don't think you've got. Anyway my catalog isn't the newest edition but it says XF ≈ $22, and VF ≈ $16
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edited to add: Decided to look this up just in case my foot was in my mouth. You have a San Louis Potosi example, KM #377.12, 0.903 Ag 0.7859 oz ASW. There's only one variety listed - an 1876/5 overdate - which I don't think you've got. Anyway my catalog isn't the newest edition but it says XF ≈ $22, and VF ≈ $16
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