More info?
There are several around that number that are ten (10) gauge.
Pictures and more details will help.
This is because Price & Fjestad in the “Serialization Book” indicate 60990 will be a 12 gauge. The book is known to have typos, so the actual piece in your hand (and pictures) will let you tap into the forum knowledge bank.
Chamber size is not indicated in the book.
How have you measured the chamber size?
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