What little I can add is this......On Gunbroker, late 1990's or early 2000's, ( which I think it was), there was a crate of 5 consecutive serial numbered, new, unissued Long Branch rifles that went to auction. In the crate, with shipping information from Canadato Belgium
. I bid on them, and didn't get them. They went for about double a fine 1950 LB from BLD was going for at the time. IIRC the crate went for a little over $3,700. So $740/rifle. I copied and saved all those pictures from that auction. The serial numbers were:
93L1581
93L1582
93L1583
93L1584
93L1585
Edit, I did find the date, 4/1/2013. Later than I remember.
All this subject to memory correction, it's been a while.
-limpetmine