Coworker is interested in my blued, 4" GP-100, .357mag. IIRC it's a first year production and I'd rate it at 99%. It was gifted to me years ago and appeared close to unfired when I got it. Since it's been in my possession it's seen less than a box of ammo through it. Gun only, no case/box or paperwork. What's a fair market price? Was thnking about $350. TIA