Dual point distributor ID question

I have a Prestolite distributor labeled "273-4 1967", but the part number on the tag is not correct for 67 according to the FSM and another reference I have. I was wondering if anyone could identify the application? I am wondering if it's for a 65-66 (I don't have any references for 66 and earlier) as it doesn't match up with any 340 numbers either. Or maybe it's a factory replacement?

2642461
IBS-4013AS 183

By the book, 67 273-4 CAP would be 2642358 IBS-4013B; w/o CAP would be 2642242 IBS-4013A (this is what is on my car, which is correct since it's from Oregon).

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