The Tobin and Lefever guns are not sidelocks. They have just some parts like the sear and sear spring on their sideplates.

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My favorite American sidelock doubles came from the little shop at 214 W. Pratt St. in Baltimore --

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These may be the finest sidelocks built in the U.S., but only a handful have been made --

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]

https://www.gunsinternational.com/g...steners-round-body-.cfm?gun_id=102423112