Dave you are better off saying it is a 720-110
I think this was used in pagodas or something really close to it.
I've found a picture here
But may be there's a manual on one of the W113 sites. It was probably also used on other pre-1970 vehicles. There's a place in australia that advertises this type of transmission as a speciality =>
Welcome to N & K Transmissions
But I don't think that's really convenient for you.