Bicycle component maker in 1930s ~ 60s. There may be a connection with Officine Mecchaniche Giostra who produced Magistroni components and later became Ofmega. Updated 10.10.2017 Click pictures for a larger view
Walter Lai pic from BicycleSpecialities site
Double sided hub.
A pair of hubs, circa 1940s on eBay by seller 8leicester
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