Interesting photo, Robert. Thanks! From what I have been able to read in TPS, that would be a stamping for your barrel's 'un-struck' weight (4lb,12oz). Even poundage numbers (possible for my barrels) would only have one numeral stamped. According to TPS though, I thought the weight stamps started around 1877? As the grade listing for #5045 is T0 in the ID & Serialization tome, and it's appearance is somewhat plain, it sure didn't look to be a grade number.
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