Scr 107p10002

Hi everyone,

I went to a Radio Rally and I got this baby for free.
It's an SCR manufactured by International Rectifier
during the eighties and it has a cute number printed
on it too: It's a 107P10002.
The rounded part with the number printed on it measures
exactly one inch, so it's a big one.
Google wasn't very helpful this time.
Has anyone ever seen one of these before ?

on1aag.

I have several that look like that but no referance yet.