Apparently Browning /FN made a run of 100 B25 shotguns in 20 gauge before the "mass production" was set up. I have consulted Ned Schwings book a bit on the topic but there are rarely any information available about the 100 pre productions guns.

All 100 guns made to same specification stock, barrels etc.?

information about prices when changing hands?

How many of the 100 are known on the market?

Any guns available on market currently?