My PDP-8/M came with a single key, the same ACE XX2247. I didn't feel like taking any chances on losing it so I went to a local locksmith. They made a working copy with no problem. The blank is a 137CLC, Chicago Lock Co. I can get a price if someone needs one. If I recall, it was under $10.
I don't have a micrometer to get decent measurements--but they appear close to the ACE XX2247 from Pete Turnbull's Key 1 & Key 2.
John
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