Sorry gentlemen but still recovering from a trip to Mexico, and not a vacation
This should help
https://docs.google.com/Doc?id=dfg2hmx7_1742r4n6vcz and
http://docs.google.com/document/pub?...eFell8GsAWd-KI
The U.S. makers most certainly continued to source rough fluid steel tubes from Belgium well after WWI.
We've found the LLH of
Laurent Lochet-Habran on Smith guns manufactured from 1914 to 1948. That of course does not establish when the tubes were actually imported.
The mark of
Canons Delcour is found on post-WWI Smith, Fox, Ithaca NID (“Best Fluid Steel”) and Ithaca Lefever Nitro Special A-grades.