I've been sent some photos of an interesting arm. It is a black and gold Odyssey RP1 from the 80's, one of five of the very first with black anodising. The diamonds on the front of the headshell were added in Hong Kong by the distributor. By that stage, final assembly, packing and distribution were done there, with the parts and main sub-assemblies made in Scotland.
I, personally, only used gemstones in the Gold Signature, which were all made in Scotland.