400

I agree, 303 rebarelled sounds like a good option.
The serial number is 600 or so away from mine.

One thing - doesn't it look like a Selective ejector mechanism ?

It certainly looks like an ejector but it is not mentioned as such
in the decsription but the Extractors are split.

Any comment ?

I hate misrepresented / wrongly decribed guns
but I still think it is worth $15k.

500 Nitro