A popular shutter supplied on many cameras. in Britain it was supplied by Houghton and Butcher under their own name, Simplex and Luxos II respectively. In the early 1930s the setting dial was replaced by a lever moving around the shutter rim.

Early models had the speeds set on a dial at the top of the shutter later models had a pointer moving over a small sector of the rim.

The Nettar shutter was listed on the earliest Nettar cameras. It was soon replaced by other models.