DF
the early 20th century 12" singles were promo only, and came in white jackets, usually with a piece of paper taped to the front with the song title, length, producer etc...
as far as i can tell the mastering of promo copies and commercial copies was the same, it wouldn't have been cost effective to remaster them again.
here's a list of the early promo only ones I have:
no cat #) FRANKIE VALLI "SWEARIN' TO GOD" / (same) 1975 (this later came out commercially, but was an edited version, the promo 12" has and added instrumental breakdown at the very end of it, that was cut off of the commercial copy for some reason.)
TCD-1 ELEVENTH HOUR "HOLLYWOOD HOT" / (same) 1975
TCD-51 RITCHIE FAMILY I WANT TO DANCE WITH YOU (D 1975
TCD-52 GERRI GRANGER CAN'T TAKE MY EYES OFF YOU 1975
TCD-54 B. C. G. (BOB CREW GENERATION) "STREET TALK" / (3 mixes) 1976
TCD-59 LOVE UNLIMITED ORCHESTRAMY SWEET SUMMER SUITE 1976
TCD-60 BARRY WHITE DON'T MAKE ME WAIT TOO LONG 1976
also the promo only copy of "My Sweet Summer Suite" by the Love Unlimited Orchestra is the one that features the nearly 2 minute long percussion intro that was also dropped from the commercial release. (they never changed the timing on the label however!)
there is a Canadian Commercial pressing of it that retains that incredible groove, why they decided to chop it off on the U.S. commercial copy is beyond me, I have heard that Barry White wasn't fond of it, but it was released on CD while he was alive on a box set of his greatest hits in all of it's disco glory, and also on the LOVE UNLIMITED ORCHESTRA'S greatest hits CD as well. BTW that CD also contains an instrumental version of "Let the Music Play"
Hope this answers at least a part of your question.



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