Matching?
You didn’t mention the barrel number. Frame, latch, cylinder, and barrel all must have matching numbers. If the barrel number doesn’t match it’s not worth more than parts. Or if the barrel number isn’t legible same same.
Folks check into this forum and always ask “what’s it worth”? Based on a few photos? Can’t be done unless your photos and description are picture perfect. I’ve never seen that on this forum.
On some of the gun sites you’ll find excellent listings with about 20 clear photos. That’s what is needed for an honest appraisal. Those smart sellers get good value and feedback.
Grips can be found for these if you shop around. Again, Id have to look at this gun “in hand” before I can determine specifically what I would do personally with it.
The $300 offer is only applicable if there are no surprises. Like a mis-matched barrel. Heavily worn out bore, bulge, cracks, damaged muzzle, damaged firing pin, the list is endless. Warped frame, bent frame, bent barrel, etc etc etc.
The action issue ( cylinder free spins?) that’s not an easy fix on this model. I’ve repaired these before.
More often the double locking bolt needs a weld. Replacement bolts don’t exist for this model.
Time consuming repairs detracts from value!
Sellers always blow that off like it’s nothing but if it takes me 5 hours to repair an antique? I’m walking away unless the seller considers my time as money and reduces the price accordingly.
Or they can find themselves a gunsmith that works for $5 an hour.
Murph