Watergill sold 2 regulators from about 1975 into the mid to late 80's. Under the Watergill label they produced the FSDS 10 (1st stage was a Scubapro Mk 5 clone) and the FSDS 100 (same second stage but a twin piston 1st stage, also had left and right hand 2nd stages option). The FSDS 100 became available in 1976. Not many of those were sold. In 1978 Watergill became Seapro and continued to market both regulators (and the AtPac). Sometime in the mid 80's Seapro come out the Zypher 2nd stage (probably a Submarex) showerhead type regulator. They also redesigned the twin piston FSDS 100 from a basic square 1st to more of a tubular 1st stage (visually looked like a USD Calypso). The company kind of faded in the late 80's and the AtPac is now produced by a company called DiveTek.
Special thanks for these informations to John Adair/Fl.
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