Welcome to the forum. You have a 1941 Mauser made Luger. "byf" was Mauser's code assigned to keep the manufacturer's identity a secret. Over the course of their period of making Lugers, Mauser was assigned several codes and "byf" was one of them. The "hump" on the back of the frame is also a characteristic of Mauser Lugers although in some years the hump wasn't used. The black plastic grips makes yours a "Black Widow" Luger, a term commonly used but is not official. A well known Luger seller named Ralph Shattuck first used the name to improve sales. The name stuck. You have a Mauser Luger that is desirable and an excellent first choice.
To record your Luger, write down the serial number as 2118u. The suffix letter on the frame is part of the serial number. Also record the chamber marking 41 and the toggle marking byf. Why? Because serial number 2118u was made more than once but in different years so the chamber and toggle are marked differently.
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