Made by Perrin Frères SA, Moutier, in Switzerland, a company well known for its jig borers, these millers were offered in two sizes, the U-0 and U-1, and also marketed by "Christen" (the latter version, in its later form, appearing to have been the more popular). The machines were built in early and late types, with little changed in the way of mechanical specification save for the introduction of infinitely variable-speed drive and the use of a box-form base housing.
Michael Garwood in Australia is try to reconstruct an incomplete Perrin and would welcome help and advice from other owners. Please email: garwood@netspace.net.