There was a thread here about 2 mths ago about a Jannsen Freres made 'The Interchangeable' marked 'Belgium Laminated Steel' which was clearly Twist. Cold rolled strip is sheet steel which has been rolled to thickness at low temperature in a continuous cold rolling mill operation. The steel is formed into a tube then welded lengthwise, and tends to split along the weld-an extremely bad happening.
http://www.hoosiergunworks.com:80/catalog/cross_reference.html does not list a "Manhattan Arms"

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