Okay, here is the full story.
O.E. Alts were supplied WITH Pulley and consequently were given specific p/ns.
Service Replacement Alts were supplied WITHOUT Pulley and consequently had specific p/ns.
Since many otherwise identical O.E. Alts only differed by the pulley installed on them, a single Service Replacement Alt (and single p/n) could service numerous O.E. Alts.
The 1100665 Alt was an O.E. alt.
The application for it was the '64 Tempest line-up with base 6 cyl motor when equipped with optional A/C, hence the need for the 55A Alt. The Date Code stamp further confirms, 3K16 being October 16, 1963. Unlike the foundry, I believe Delco skipped "I", if not, then K would be Nov., either way, early in the '64 Model Year.
AFAIK, this O.E. alt had no other usage. The original Service Replacement alt was 1100633. The 1100633 serviced all 52A and 55A O.E. Alts for '63 & '64. The 1100694 was the '65 up Service Alt for 55A applications which had some improvements vs. the '64. Certainly, this Alt could have been swapped into a big car and worked fine, but the regular '63/'64 big cars did not have any 55A applications to my knowledge (52A yes, not 55A). I believe the '63 Tempest V8 had a 55A application, but believe it was O.E p/n 1100627.
The SD Alts were an exception. Don't know why, but they were serviced by the O.E. p/ns (there was more than one '62-'63 SD Alt, depending on application). Not sure why, but presumably these were serviced with the pulley.
BVR421, in '64 ('63 also I believe) there was a big car HD Alt option for a 62A Alt, and for the V8 with TI & A/C options for both the big car & Tempest you got a 60A Alt.
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