I have not heard mention yet of BLY BMX pin either (only 406 made)
and GTB Star Race (~ 870 made)
and other low production BLY pins like Lady Luck and Beat the Clock from 1985-86 era (500 each).
For S/S era <500 is considered rare,
but in EM era that was a normal run in the 50s & 60s for many pins.
i have acquired dozens of "rare low production" pins from all those eras,
not sure why, probably more for the thrill of the chase/hunt.
Most now will be in the PPM collection.

Reason why so few Spectra IV cocktail pins are in working condition
is that all the boards were stacked together
one on top of the other and the ni-Cad batteries
would leak onto boards below and eat the traces.
Mine was bought NIB from a warehouse find
and most all the boards had acid damage, with a lot of the traces destroyed.

Made a great kitchen table!