I.D. of an Ignition Module

While trying, somewhat futilely, to get a bit more organized in my shop, I came across this ignition module in a tub of ignition parts. Due to OFS (Old Fart Syndrome), I have no idea where I got it or where it came from.
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It's a five pin, and I have no idea what the adjuster is for- a rev limiter, perhaps?
It is only about 2/3 the size of a standard module, and no transistor/heat sink on it... no markings or numbers on it whatsoever.
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Anybody have any ideas? Thanks!