With support from Christian VI, Winsløw travelled to first England and then Paris where he trained as a medal engraver under Mikkel Røg.

Winsløw converted to Catholicism and was in 1737 engaged as French court medallist.

He created a medal commemorating Christian's births in 1745 and Christian VI's death in 1746, the coronation of Frederick V in 1747, the royal anniversary in 1749, Queen Louise's death in 1752, the wedding of Frederick V and Juliane Marie's coronation that same year.

He also renewed some coin pistons dating from the early reign of Frederick V. His work soon turned out to be under the expected standard.

The Royal Academy of Science commissioned a series of jetons commemorating the rule of Frederick VI but it was never completed.