S&W Pre-Model 26

Some years ago someone here posted a picture of their Model 25 or pre 25 with that type of mainspring.

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I believe you are correct Mike. I think I pulled that post up, but the picture was no longer available. There is also a GunBroker listing with a picture of the U main spring. I did not want to link it since it is an active listing. The U spring was not in all Pre-Model 25's according to the pubication "Standard Catalog of Smith & Wesson". There was also a W shaped main spring.

I did not find anything discussing the advantage or disadvantage to the unique springs. I assume there are fewer revolvers with these type springs.
 
I THINK those main springs were originally developed for bullseye guns. I seem to recall that they were supposed to provide smoother action cycling than the traditional spring.
 
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