The SB&Co mark on Lefevers is likely Samuel Buckley & Co. rather than Sanderson Bros. & Co.
The LLH of
Laurent Lochet-Habran has been found on Fox, Baker, Lefever, Crescent, Ithaca (Lewis & Flues with Smokeless Powder Steel), NID, Lefever Nitro Special, Lefever M-2 single barrel, and Westernfield Deluxe/Western Arms Long Range, Smith Royal, Armor, London, Crown and Nitro barrels and Hunter Arms Fulton and Ranger for Sears. Baker guns may be marked Nitro Rolled Steel and Folsom Crescent guns Fluid Temper Steel.
More here
https://docs.google.com/document/pub?id=17ixogftgITEblNUWtmFBv96ZvgjK6eFell8GsAWd-KI 
