DHE barrel

[Pa SxS]

A recent new Parker owner showed me his DHE 12ga. 2 barrel set. The original Titanic barrels are 26" on a 1 1/2 frame. The gun was manufactured in 1936 and has all the Meriden features except the stock and forend are not original. The second set of barrels I believe were added by Parker in September 1937 due to the repair code on the barrels. They measure 31 3/4" with the space at the end of the matting. The first set has a 1 on the forend lug and the second set and forend lug has a 2. The second splinter forend is marked 2 and looks like a correct Meriden forend.

What's confusing is the second set has only Parker, Meriden, Conn..USA on the rib as you can see from the picture. The right barrel flat has a 0 but no letter inside the 0 as seen in the picture. The left side of the barrel lug has "D Grade 12ga.

I'm assuming that these barrels were added in September 1937 shortly before manufacturing was transferred to Ilion NY. Has anyone else seen barrels similar? It's almost like they didn't completely finish the stamping on the barrels. I found no examples of this type of rib inscription in TPS.