French pressing plant, manufacturing and distribution company which stemmed from their original pressing plant in Averton (Mayenne), France, established by Pierre Tyrel de Poix in 1957. The 'MPO' acronym remains from the original company; 'Moulages et Plastiques de l'Ouest'. Through expansion, MPO has permanent offices throughout the world, with a strong presence in Europe. The group's operations are structured around its three production sites and logistics centres; MPO Iberica and MPO France (Averton and Villaines La Juhel) and MPO Asia (Bangkok, Thailand) and numerous sales offices in Europe and Asia as well as a partner in the US.

MPO is an acronym for "Moulages Plastiques de l'Ouest" (in English: Western Plastics Castings).

MPO pressed its first commercial CD on 4th of December, 1984.

Vinyl discs pressed by MPO usually have the hand etched "MPO" inscription in the runouts.
Recent presses could also show a stamped logo followed by a string of digits ## ##### (see this image), where the first two digits stands for the pressing year.
Another identifier can be that MPO pressings have three concentric rings around the spindle hole (see this image).
MPO can be credited as M.P.O. on releases.

On cassettes: "Duplication MPO", most often printed on labels.

MPO CDs made at Averton are assigned the following SID codes:
Mastering code: L031, L032, L033, L035, L036, L039, LY88 (often misread as LV88)
Mould code : 12##

MPO isn't always explicitly mentioned in the CD matrix, but can sometimes be identified by a string of tiny text with the following format:
CA [label cat#] [one or more @] IFPI [mastering SID code] M/D/YYYY HH:MM:SS [AM/PM] NNNNNNNNNN
(This isn't usually allowed, but there was forum discussion for doing this for MPO in particular.) If you aren't sure, please ask in the forums.)