This is an old bike of mine dating from the 40's. It has a 4 speed Osgear gear system. I know it's not what this thread is all about (SA) but it is 4 speed.
The bike is great to ride and weighs in at about 22 lb. - not bad for the '40's. The gears change without incident as long as they are not under pressure and the chain tensioning arm can be 'trimmed' to give an optimum tension.