Sometimes called a decimal tab typewriter, that row of extra keys on your machine is an accounting aid, and essentially were used to move the carriage at preset tab stops to line up decimal points.

Do they add value to a machine. Not that I've ever seen. Machines like the one you have don't turn up as often, but I wouldn't describe them as rare. I suppose it's possible that some collector who is really after such a model would pay more for it, but I think most buyers don't consider it to be a highly desirable feature.


I assume your typewriter looks something like this one?

It depends on where you live actually. I recently bought a KHM for $50 (CAD). Even though it had a mouse nest under the type basket and was completely covered in filth (I'm still cleaning it), it is in great working condition. I've found that 95 percent of typewriters can be bought for $50 or less. Only the truly old, or really rare, command higher prices. The one exception are typers that are finished in a pretty colour. Buyers (probably not serious collectors) seem to covet colourful machines and are willing to pay crazy prices for such them, which is why I won't be repainting any of my typewriters in black.