Thank you, series guy, for showing the difference between a box joint and a dove tail joint! I have seen 4 different joints on the S&W cases. The lapped joint, pictured by OP, the box joint picture by series guy, the male/female joint pictured by RT44nut & WV2A, and last is a standard 45 deg mitered joint. Th box joint is, by far, the most common joint used on these cases. The others I have seen a few, enough to validate they were S&Ws. You may ask, "which is the best"? I have repaired them all because the glue did not hold over the last 50-60 years. In this application there is not a best one!
jcelect