Other number

[Jerry Andrews]

My underlifter also has a second number on the barrel flats. Wonder what this means? At first I thought it was a mismatched number until I could see the number on the side of the lug. It's obvioiusly not a mismatch but wonder what it means? Jerry

[Robin Lewis]

The order number is sometimes stamped on the gun as well as a serial number. It could be an order number?