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As dusty3030 has already mentioned, there are no currently manufactured Lasers that are specific to the Model 457
There are quite a few different generic style lasers that could be mounted, but they are not elegant at all
Most attach to the front end of the trigger guard and go forward from there. You would never be able to holster it
Here is an example on a different semi-auto
Image courtesy of HandGunLasers.net
The Model 457 was part of Smith & Wesson's Value Series
Most mainstream accessory companies did not go heavily into aftermarket accessories specificaly for those firearms