Found it.
some specs
fits on a 1 1/8 threadless fork (~28.5mm)
140mm vertical travel.
locking lever holds it securely
tiny lever releases the positioning pin
shim on the top for 1 1/8 threadless stem. remove-able to fit a 1" threadless stem.
black
mostly alloy
Brand is OCTAGON. A commercially made product.
No idea of it's age, probably within the past 20 years.
company web site is
https://octagoncycles.com/
Retail is about $40. Looks like your lbs will have to order. I don't see any for sale on the www.
You might need to install longer cables.
The site has better photos & graphics and a good video on how to install it.
