Yeah I’d say that’s worth 300. Especially if the finish is original. Hard to say from the pics. If it looks like letters or the logo are buffed off it got refinished at some point. I believe that’s a 6” barrel. It may be 4 and a quarter to the frame but you gotta go all the way back to the cylinder face.
Yes, based on the photo (always a bit risky), that gun is definitely worth 300, probably more. I think it’s a 5” barrel; the perspective is skewed. Finish looks original, case color on hammer and trigger is vibrant, all appears in very good shape. Unless there is a major issue not visible, or mechanical, I’d go for it without hesitation.