Ersce Brema 30MM Industrial Panel Rotary Switch Knob Momentary-Retained-Retained

Description

2847XB3H.20
New / Unused Old Stock Ersce (now merged with Bremas), 30MM Panel Mount Rotary Switch Knobs, Momentary-Retained-Retained, Part Number Unknown.  Each bid quantity is for One (1) Switch Knob.  You may bid / buy any number, up to the total quantity available above.
Operation is Left (momentary) - Center (retained) - Right (retained).  Fully Left is Momentary, and the knob returns to the center position when released.
These were purchased at an industrial liquidation earlier this year, and we don't know a lot about them.  We packaged them in heavy Ziplok bags for resale.  They are heavy, rugged switch knobs, designed for commercial or industrial control applications.  They have a large rubber seal beneath the chrome plated bezel.  Best we can tell, an electrical contact device (not included) snaps into the base.  Not sure about availability for those, but it shouldn't be hard to rig your own.
According to the calipers
:
Overall housing diameter:  1.553" / 39.46 mm
Thread diameter (mounting hole size required):  1.172" / 29.77 mm
Mounted height:  1.399" / 35.53 mm
Metal base cylinder outside diameter:  .808" / 20.54 mm