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I picked up a joblot of boards from a retired op recently,and these were amongst them,I know they are opto's but which machine(s) are they from,they look brand new,but I have no way of testing them,any idea value wise also,as they will be heading for the forsale section shortly.
There was an updated optic pcb for single drop targets that used a cushioning bracket like that. A Whirlwind that didn't have it would regularly break the optos' connecting legs, while a later one which I think had one like this didn't.
The single target opto board for Whirlwind is listed as C-13311.