Didn't mean to infringe on anyone, SmithNut...but this Les Jones, fella, whoever he is, had the best photo of the fluted 627-3 on the web. Perhaps the ONLY photo of the fluted.
So can one just look at the original vs. the new internal lock one and tell the difference? or no, one must look at the serial number?
aha!
http://www.imfdb.org/images/thumb/8/89/BW-M627-3.jpg/600px-BW-M627-3.jpg
albertjohnson,
My apologies for an untimely response. You are not infringing on anyone, if anyone is it's someone like Les Jones that posts other folks picutes on the web, for what ever reason. This gets under my skin, and others, so my previous post was only meant to underscore the fact that it wasn't Les Jones picture
or gun in the pic.
To provide some answers, let me start with this - first, the picture posted isn't a M627-3, it is from the first production run and is marked as a M627-PC.
To give you some ideas of how these are visually discernable from the later models, here's a pic, I'll explain the four areas below the pic.
1- The early guns had a "normal" frame for the time, meaning it had the pre-frame mounted firing pin sized frame, but it had the frame mounted firing pin. This is evident due to the area behind the frame between the hammer, this "gap" is due to the earlier frame contours in this area. The later guns had a beefed up area here, so that the later hammers would not leave the gap.
2- The later hammers are all "normalized" so that one-size-fits-all, i.e., take a look at the
size of the hammer in this pic and compare to a later M627-3 gun, the hammer on the later gun is much smaller, they use the same hammers now on all frame sizes from K to L to N to X frames, and to me they all look kinda stunted in growth and in the case of the X frames, they are hideously small.
3- Of course, this picture is missing the later model's lock.
4- The later guns also have the integral frame lug (cylinder stop), which is integral and much longer. The early guns have the older pined in frame lug, which to some of us is more traditional.
So, there are many differences, not just the lock, that differentiate the early guns from the later guns. The "Bloodwork" gun is an early gun, missing some of the improvements

() of the later guns.