Wanted: Simple Altitude Bug

-Dose anyone know where I can find another one of these altitude bugs?

-I've been using this one for 20+ years to keep track of flying assigned altitudes... helpful to me.

-Will purchase any used ones that still work.

-I can't seem to find them but perhaps I'm using the wrong nomenclature?

-Thank you in advance.
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P1080527.JPG (107.25 KB, 165 downloads)
P1080588.JPG (161.51 KB, 167 downloads)
P1080409.JPG (80.06 KB, 167 downloads)