David:
I have one in 12Ga. 2 1/2" chambers 30" BBls Choked full & Full, MFG in 1927 Mint over all condition. SER#.3072
Case color receiver, Ejectors. If you remove the rectangle shaped piece found inside the forend, you can convert it to plain extractors. The cross bolt type pin at the top of the receiver is to change the safety from auto to manual. Very interesting well made double. Sorry I don't have too much information on them. Any information you can add would be great.