It looks quite a lot like a Ricohflex, the early style, before they came out with the Diacord types. Shutter sounds
just like a five speed Ricoh, too, which have the same speeds as yours. They often crop up with similar shutter
troubles, too.
I think it's a good idea not to take it apart yourself, unless you are good at it. I've worked on a number of them
in the past. Bit fiddly. I'd use it like it is, and if you find you enjoy it, send it to a repairman to get her fixed up.
You probably wouldn't enjoy working on the shutter, and if you did get it fixed, you probably wouldn't enjoy getting
the geared lenses timed, either.

Dean