Micro Seiki RX 5000

Or maybe the pump is missing. If it will not turn or has a FV designation, don't force it!

The spindle should unscrew by hand. It may be frozen from age. Take it off without burring or scratching by using a cloth and light plier work. Lube it when putting back on.

I concur with Elizabeth but If I were you, I'd take the whole thing to a high end turntable specialist to bring back to full glory. I've been looking for one of these for a while. Good luck.

If it is an air bearing platter, it will not rotate without the pump without damage. If it is an air bearing platter, the spindle should unscrew with only finger pressure. Look here. http://www.vinylengine.com/library/micro-seiki/rx-5000.shtml
And here.
www.my-micro.de/micro_home_gb.htm

Don't worry, that one is without air bearing. I think, those have the "SX ...." model name

I found some pics

RX5000

RX5000 Bearing 1

RX5000 Bearing 2

RX5000 Bearing 3