How did it lock up? Under bits through bolts and did the lock up change over the years? My grandfather had an AJ Aubrey and I've talked to my Uncle about it but no one seems to know where it is. My Great Grandfather hunted with a double, they were all oppurtunity hunters, slugging one and shot in the other in case a deer or a rabbit showed up. Defintely only hunting to put food on the table and nothing else, no better design then a double for that, and my Grand father learned to hunt from him. I showed this thread to my Uncle who identified that my Grandfather definitely had a AJ Aubrey.
All the best