A "G" grade - the 1 1/2 is the frame size, the 3 13 is the unstruck barrel weight. The "D" in the barrels tells us they are damascus.
the gun is not is the serialization book, however a search on the serial number says there are surviving records on 139925.
you may want to consider joining as a PGCA member and ordering a letter to see what you can find out about the gun.
could you add a picture of the muzzle end of the barrels from the front and the top?
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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