Joseph Cap prooved in 1926 http://www.littlegun.be/arme%20belge/artisans%20identifies%20c/a%20cap%20joseph%20gb.htm
He used the Eagle and 'Compound Steel' trademarks.
The bore is 16.9 mm = .665", right choke constriction 16.4 = .646" and left 16.2 =.638".
Interesting 70mm chambers for a 16g of that time period, and looks to be a very nice BLNE.

Last edited by Drew Hause; 08/02/09 11:22 AM.