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Glen,
Roger is correct. It is a Lucas BM4 model. Part number for that particular unit is 36200B. For the BM4 ammeters, the part number was stamped on the side of the chrome plated brass bezel. The tabs on the bezels had a tendency to break off when the instrument was worked on, so sometimes they were replaced with one with another part number. These bezels are also being reproduced in the UK.
AJ
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