I'm sure it is a Runge-Del Grego upgrade and should be marked as such. However, some upgrades are signed in very small letters.

Right Bill, the Runge upgrades are all signed and if it's not in the engraving like my last one then it's under the trigger guard which Bill said they had not yet removed. The last A upgrade .410 that I saw was sold at our club several years ago for 33K.