The (Original) Wireless Set No. 19 Group Discussion Forum
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It's a British made set, and the R/RAC/NDnnn setial number means Refurbished/RACAL/and their serial number. (The ND may well be their factory location code). I have an apparently new control unit (in a fairly odd shade of green) that was refurbished by them, and it has their details on the cardboard box.