IMO the lock on a 617 is a non issue. It's a plinking gun, no loads. hot enough to trip the lock even on a bad, bad day. If you don't like the looks, get "the plug" (search this forum) and it will look OK. $700 is a reasonable price for any 4-incher. $400 is a total bargain.
I had a 617-2 Plus with a 6-inch barrel and stainless cylinder, here it is, a beautiful gun:
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(cleaning by MPro7 products)
I also had and kept a 617-6 Plus because it is so nicely balanced and very similar in size and weight to other 4-inch K or L frame revolvers in larger calibers. I can pick off small chards of clays with it a 50 yards. I get the evil eye from some shooters when I do it. I let 'em try it out and most say, "I gotta get wunna those."
I must have a rare 617-1. It has the square butt, combat wood grips,target hammer and target trigger. Sorry,no pics but some day Ill figure that out to..LOL
Lots of guys here on the forum are up-to-speed on the 617 dash numbers and I likely got my information from a post right on here. Sometimes...you can't always be sure, or know it's current, but there is enough to see that Smith went back-n-forth with the 10-shot cylinder until they eventually found a machining process that would work with the stainless steel material. I just don't think they finally got it right until the current run (dash 6). There was a period of time in the process that they built the SS 10-shot and then took it back, went back to the 6-shot and eventually landed on a good 10-shot SS....I guess.