These are really geared reduction motors, but much smaller and of lower power. Often used to operate cams and switches in electrical circuits, or to drive displays, they can generally be operated in continuous applications if not heavily loaded. Most are about 2" dia. x 1-1/2" thick. You'll need a way of supplying 230VAC. 

These small timing motors draw 3W and are just under 2" dia x approx 3/4" thick with mounting wings that have (3) 1/8" holes. You pick: the 11VAC motor that spins 1 rpm CCW with a 3/4" long shaft with an attached 3/4" dia x 1/4" thick 16-tooth gear, 24-pitch and 20-degree pressure angle; or the 24VAC motor that spins 1 rpm CW and has an 8-tooth, 5/16" dia x 11/32" plastic gear, 32-pitch and 20-degree pressure angle.

Don’t cry when we send you this teardrop-shaped 12VAC 4W synchronous motor from Autotrol, because it’s a beauty. Spins at 6 rpm via a 1” x 3/16” flattened shaft, and measures 1-15/16” at its widest x 2-1/2” x 1” thick with a pair of twisted 7-1/4” leads and a 5mm 2-pin connector. Has (2) 3/32” ID threaded mounting wings. Made just up the road from us in beautiful Crystal Lake, Illinois.