Note: The names Pye Studios Marble Arch or Marble Arch Studios can also be found on releases but are one and the same studios and all such entries since 1960 also belong here.
Pye vinyl cuts can be identified by the specific run-out etchings, which were generally stamped (up to 1976) and handwritten afterwards (although handwritten ones can be found earlier, too). The pattern consists of the matrix number (generally the same as the catalogue number), with a suffixed side identifier 'A' or a 'B', followed by a hyphen and a single number (usually '1'), and then followed by either a diamond (until 1974 identifying the Westrex Scully stereo lathe and from 1974 onwards identifying the Neumann SX74 lathe) or a triangle (until 1968 identifying the Westrex Scully stereo lathe and from 1968 onwards identifying the Neumann SX68 lathe) or a star (identifying the Westrex Scully mono lathe, operative until ca. 1974) in combination with an engineer's initial, symbol or tag.
The following initials/symbols/tags were used:
BJ was used by Bob Jones (6) with the △, ♢ and ✳ prefixes.
F was used by Bill Foster with the △, ♢ and ✳ prefixes.
G was used by Gordon Vicary with the △, ♢ and ✳ prefixes.
H was used by Howard Barrow with the △, ♢ and ✳ prefixes.
J was used by Geoff Calver with the △ prefix.
M was used by Derek Moore (3) with the △ and ✳ prefixes until 1966.
M was used by Malcolm Davies with the △ and ✳ prefixes since 1967.
MB was used by Mike Brown (3) with the △ and ♢ prefixes.
N - so far unknown, with the △ prefix.
S was used by Derek Sticklen with the △, ♢ and ✳ prefixes.
T was used by Tony Bridge with the △, ♢ and ✳ prefixes.
W was used by an unknown engineer (W (20)) with the △ and ♢ prefixes.
X was used by Ian Cooper with the △, ♢ and ✳ prefixes.
The π symbol was used by Mike Brown (3).
noel was used by Noel Summerville.
tone was used by Tony Bridge.
The letter (later two letters), e.g. A, at nine o'clock stands for the stamper number and the number at three o'clock, e.g. I, stands for the mother number.
When the rights to the name Pye expired, the label changed its name to PRT (PRT Records) in September 1980 and subsequently, the studio changed its name to PRT Studios.