What is my tonearm??

What does suitable mean? They will all fit the existing cutout in your turntable without cutting. They will work well on your turntable.

Are they suitable for the Lyra Clavis? Ask a dozen people and you will get a dozen answers. It wouldn't be my match made in heaven.

I'd say that the RB-300 is probably the weak link with that table. But there are a lot of nice options for tonearms with the Rega geometry. I am a big fan of the Audiomods arms.

I have one also. Basis used to (maybe they still do) sell these with the 2000 and 2001 turntables as an entry level arm. They have a smooth sleeve instead of threads on the outside.

If you want a big upgrade in your sound replace this with a Basis Vector tonearm. It is a drop in replacement. They come up for sale occasionally. I replaced mine with a Basis Vector 3 and the improvement was amazing.

Do not buy a Basis Vector tonearm for the 2200 - 2800 models. You need the low cup model for a 2000 or 2001.

You should check with Basis to see if the Vector arm is a good match with you Lyra cartridge. Just send an e-mail with the Lyra specs. I think it should be fine because the weight and compliance of the Lyra is similar to my Shelter 901.

Aren't the rega 250 & 300 typically black? Seems like it looks like a 600??