Hi, new to smith & wesson, I came upon a nice looking firearm, it doesnt have the rear sight though. I want to get a new one and there are so many options, can someone help identify exactly what firearm I have so I can get the correct rear sight? I did some googling and was referred to this forum and to ask here. Any help is appreciated, thank you.
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Any modern rear sight with the rounded front tang will fit your gun. It's hard to tell from the photos but some of the -3 guns had a sight that was longer than standard. If your gun uses this sight they are not to be found. The new sight will fit with a slight gap in the front. I solved the problem by mounting a red dot sight.

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Thanks for the info. What pictures could I take that would help narrow that down, and if i wanted to go the rds route, what would I search for the mount? 629-4 rds mounts? -3 hole mounts?

ETA: It looks like this would work for a standard rear sight, correct?
LPA Ghilardi

Check the measurement from the center of the screw hole to the radius. I get .445 on a spare sight that I have. Raptor Engineering and Alchin both make fine bases for the Burris red dot and others. The sight you linked to will also work well. You may need a taller front sight blade with it. I'm sure they can tell you that. Looking at the stamp on the yoke Weigand had a hand in your gun. Not sure what they would have done but I would think the action should be pretty sweet.

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Luckily yours is a 629-4. The -3's use a unique rear sight, pretty hard to find. Midway USA has a pile of rear sights. The rear sight is held in by 1 screw, and the rear part of the sight has a screw also that sits in slot on the back of the frame and when you turn the elevation screw it brings the sights up and down. Those other 2 holes you see on your frame are for a scope base. The scope base uses 3 screws to hold it to the gun. So 1 screw is the main one that holds the rear iron sight on the gun, the other screw sets in a slot and adjusts the height of the sight. Hope this helps. If you have any more questions, just ask!!

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Pure power and speed!!

Also I will add any of the new style rear sights for the S&W 629 will work. If I am wrong, someone correct me. Like I said Midway USA has a lot of S&W sights.

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Pure power and speed!!

This should get you back on the road. https://www.midwayusa.com/product/1004423447?pid=194815

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Don't You Ever Wash That Thing

Thanks for all of the suggestions, folks. I actually had a good laugh from looking up rear sights for this gun, and from this thread. I actually know the Allchin family, my best friend dated his older daughter, she's a good friend. Years ago she invited us to go shoot skeet with the rest of her family, it was very fun. What a small world.
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Give S&W customer service a call. They may be able to hook you up with one. One of the changes with the 69-4 was to drill and tap the frame, hence all the screw holes. They also changed the rear sight leaf at the same time. Yes, I think your best bet is to check with the factory and see if you can obtain the correct one there. The phone number for Customer Service is: 1(800)331-6852.

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Ed