Hi, I believe you are referring to the model 686-3, which was made in 3" and 4" versions for the US Customs Service and stamped CS-1 in the frame/yoke area. By reputation their finish and actions are a bit nicer than the standard 686-3 of the era, but those who have one will no doubt chime in on those counts. Hope this is helpful.
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Alan
SWCA LM 2023, SWHF 220
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