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Hi Steve, sorry to take so long to reply, had to do a bit of research. If I have the history right then your arm is now up to the series 4 specification.The version history is like this:Series 1 arms are very early, they came fro the idea that I could build ten kits like my own prototype and I think there are only about twelve of them. Very different in many ways and six have been updated a couple of times to bring them up pretty close to current spec. Serial numbers <27Series 2 arms had a lot of changes, including a new arm yoke design that didn’t change much until now. New outer base, smaller top plate, new horizontal bearing carrier to take standard Rega wiring looms. At around s/n 35 the bearing supplier was changed to the current one and the spec changed slightly. About s/n 60 the counterweight shape changed and stainless steel became an option. Serial numbers < 69 The original “enjoy the Music” review arm was series 2The series 3 arms were a major change as all of the first-stage machining went to CNC, laser and water-jet machines. The Deskadel/Michell silver litz loom was introduced and the shape of the micrometer base was changed. Stainless steel counterweights standard. Based on new RB251 arm tubes. The finished arms were supplied in a wooden box with two counterweights and copper headshell shims. Serial numbers <140, though the series 4 bearing went into a few arms a month or two before. The Hi-Fi choice review arm was series 3.Series 4 arms were introduced in the summer of 2010 and included a major bearing re-design, new VTA lock, alloy arm rest, updated wiring extra, alloy shims. Cryo-treated arm tubes and wiring and gold plating introduced as options. The first “official” S4 arm is s/n 147, though the TNT-Audio review arm (s/n 140) is series 4 in all but the alloy arm rest.The kits have officially remained to series 3 spec, though they started to get the S4 bearing at about s/n 200. The last micrometer arm kit will be s/n 393, though the standard ones will continue.The Series Five arm is a major re-design in the arm yoke and bearing and also in the matt finish, which I had done as a special for Feickhert. There are quite a few internal changes and the detailed prep of the arm tube has changed. The S5 arm yoke is in preparation for a 12” Carbon fibre arm tube which might (or might not) be marketed only through a third party.First S5 serial number is 366, Feb 2012.The “Classic” arm is really a series 3 arm with S4 bearing, single brass counterweight and Cardas wiring. First s/n 322, October 2011.Regards, Jeff
