John Holroyd, successfully patented the SPIN-MASTER Mk 1 reel in 1950 after lodging the patent application three years earlier. The patent claimed that the reel offered an improved line laying capability through the use of a cam - controlled level wind mechanism. The first model was made in 1950 from die cast metal & aluminium alloy using dies made at Holroyd Motors.

Production is estimated at 1000 to 1500 reels. A second model was introduced in 1957 using polyamide nylon for construction of the gear housing cover and rotor. Only 500 to 600 of this model made. Holroyd was considering reverting to the original aluminium alloy construction when the government lifted import restrictions, making the Spin-master no longer economic.