Try looking at Ofmega CX sealed bearing hubs. I think they might be identical to those Avocets.
IIRC, there were two versions of the CX issued by Ofmega. The earlier one having oil ports and the later one having none.
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72 Line Seeker
83 Davidson Signature
84 Peugeot PSV
84 Peugeot PY10FC
84 Gitane Tour de France.
85 Vitus Plus Carbone 7
86 ALAN Record Carbonio
86 Medici Aerodynamic (Project)
88 Pinarello Montello
89 Bottecchia Professional Chorus SL
95 Trek 5500 OCLV (Project)