The Last Confederate said:
If your want 1095 carbon steel and USA made, I think Mooremaker is gonna be your best, or only bet.
http://catalog.mooremaker.com/viewProduct.cfm?item_id=392442
I agree, that is really it for a current production, USA made, carbon steel, 4 blade congress. That Moore Maker is of course made by Queen.
Camillus has made a few limited runs of small 2 blade congress patterns in carbon steel and with celluloid handles in recent years, but I don't believe that they are still in production.
The list of US knife companies that actually make slipjoints is a pretty short one...Case, Camillus, Queen, Bear & Son, Buck, Colonial, and Utica.
Of those, only Case, Camillus, Queen, and Bear have offered congress patterns in recent years. Bear uses stainless steel 100% as far as I know....all of Cases congress offerings are SS these days....Queens are D2...and for Camillus, see above. I think that Case may have offered their 2 pattern 4 blade congress in CV for a few years, but that was maybe in the late 90's. Other than that they have not made a CV congress pattern since 1981. Queen makes some limited run Schatt & Morgan and Robeson congress patterns, but in 420 stainless.