Outdoorlvr,
I'm on travel and away from my reference material. I'll do some digging later in the week and see what I can discover in the older SD&G material on Manhattan Arms that might answer some of your questions.
A couple quick thoughts -
On the Lefever question - SD&G had Daly guns built on the Lefever 1880 sidecocker patent but all the Daly sidecockers I have seen appear to have been made overseas using that patent. I'm not aware of any Lefever built guns bearing the Charles Daly or SD&G name.
I would cut off 10 years from the SD&G tenure (late 1920s vice late 1930s). A series of reorganizations/sales kept the firm going past the late 1920s but technically it was no longer SD&G. Kinckerbocker was added to the name and short time later KSD&G was dead and Charles Daly, Inc. was born. I know I'm nitpicking here.
More to follow,
Ken
