I'd say it is a Makina II, mostly because of the mount type. It has several details that points me to it. Lens seems to be one of those that comes in two parts, one screws in front of the shutter and the other behind, folding finder is rounded...

Here's one like yours but in black.

I have seen a few with flash sync connector added at a later time. Yours looks nicely fit from the small photo. The flash "socket" on top of the RF housing is also a later addition by some owner.

As for servicing, removing the front panel allows easy access to most important parts. To adjust the RF, one of the front screws on the nameplate (don't remember off-hand which one but it should be easy to find out with a quick search) should be used.

Which lens does it have?