It's a 180E(one eight zero) because of VL&D's numbering scheme: http://www.cornellpubs.com/old-guns/item_desc.php?item_id=999 . I really haven't researhed why the retailers numbered how they did(probably originally based on price??). Purchase either the VL&D 1927-1928 or the next offering and yours will be the Model 180 Sauer.

I'm curious if Paul Werner worked on the Sauer sidelocks and was responsible for the late Sauer sidelock offerings?

Kind Regards,

Raimey
rse