Curious record side labeling


Do any of the jazz gurus on here know why some double-set records have this curious side labeling where record 1 has sides A and D, and record 2 sides B and C? It does not make much sense to me, and I wonder what purpose it serves other than to confuse the listener. I noticed this with a couple of Coltrane records from the '60s, recently with "The Other Village Vanguard Tapes."
actusreus
Many of my gatefold albums from the seventies or before come in that format. Most of them are bluegrass music. I just love to play them on my good old BSR with a ceramic cartridge tracking at about six grams or more. The sonics are to die for!
I try to avoid auto-sequenced sets, which are a *pain* to deal with if one has a manual TT. When buying used multi-LP sets, I always ask if the records are in auto or manual sequence. Auto sequence is usually a deal breaker for me.
Rshak,I agree it is a real pain,but sometimes I will buy a sealed Lp and there is no way to avoid it.
It's really amazing me that this is such a surprise! I guess I'm showing my age.

Normal people who played records back in their heyday wanted some level of convenience. Automatic start and stop and record changers in particular were the norm by far. Most were very cheap and made for mass consumption, but that was the norm. Dual is the only brand I recall that made decent quality changers. I still have mine, a Dual 1264 in my second system. It is serviceable but not up to snuff for most audiophile vinyl affectionados. I do not recall any changers that were much better. CDs took convenience to the next level. Now, music servers take it further. And performance need not suffer along the way.
Mapman, I grew up in the '70s and early '80s way before the CD era and LP changers were not the norm, at least in Europe. In fact, I didn't even know they existed until this thread. Juke box changers, sure, but not products for individual use.