The "closest" thing which would've been near the master source when *new* (and: NOT duplicated from any dubious RIAA-eq'd "cutting master" down the line) would've been: the 3 3/4ips reel to reel tape of Columbia catalog number "HC1212".
Since it's a collector's novelty for the sake of sound comparison purposes: I have a 16/44 WAV upload of my copy on a soundcloud. There's (obviously) more hiss at the slower speed (and, as I did NOT use any outboard NR filtering); however, next to (I think?) the discrete quadraphonic 8-track-only mix (the cart in the orange case?)....this reel IS one of the cleanest-sounding analog (original) sources of B.O.T.W.
side 1
https://mega.nz/file/Cd1WzZpb#TaWR-a7p1yIhdlWzAbg980KJjhgTPldL5X1jeiFc8Bo
side 2
https://mega.nz/file/fFkG2TLA#CRYQw9vZl_6HhSne6Qs07FkNvS5SX4DKRI664TX8rTw
Since it's a collector's novelty for the sake of sound comparison purposes: I have a 16/44 WAV upload of my copy on a soundcloud. There's (obviously) more hiss at the slower speed (and, as I did NOT use any outboard NR filtering); however, next to (I think?) the discrete quadraphonic 8-track-only mix (the cart in the orange case?)....this reel IS one of the cleanest-sounding analog (original) sources of B.O.T.W.
side 1
https://mega.nz/file/Cd1WzZpb#TaWR-a7p1yIhdlWzAbg980KJjhgTPldL5X1jeiFc8Bo
side 2
https://mega.nz/file/fFkG2TLA#CRYQw9vZl_6HhSne6Qs07FkNvS5SX4DKRI664TX8rTw