[painter*]

That gun looks like an early hand engraved example. I have an early 600. Great guns

It's value, IMO, is determined by if it ischoked for what you want to use it for. Those guns are solid shooters, but with fixed chokes can be limited in usefullness.

 

[painter*]

How would I tell what the chokes are? They don't appear to be removable.

The choke markings are on the flat surface just forward of the pivot groove on the barrel. You'll need to take the barrel off to see it. It should be on the right hand side and will be words, not a code.

The attached .pdf should help.