I'm looking at a listing and was wondering what would you pay for a Symmar-S (with shutter, no lens board) in what looks like fairly good condition?

I've read that even the single coated Symmar-S 300mm is a crackerjack of a lens and very sharp. Is that true? I'll be using it on a 4x5 view camera for portraits mainly.

Thanks for any advise you could share.