Unusual variation of Vibroplex semi-automatic key. Here is a left-handed Vibroplex Presentation with Blue Racer hardware (I think) and a Blue Racer size base. But alas, no La-Hiff adjustable mainspring.

#4 L Presentation Lefthand 188359.jpg
Serial number: 188,359, 833 Broadway
which dates from 1955, however the Presentation would have been made with the La-HIff adjustable mainspring, which this key is missing, see photo. So it is a beautiful fake.

73

DR