Need Info on S&W Revolver Props

[JeepRacer]

I have obtained over the last few years a good inventory of the Blue Dealer Gun Props.
I have noticed that there are 2 blue props. One is a lighter blue, and appears to be the older version. The other is a darker blue with a register TM on the face of it.
Does anyone know the dates of production of these 2 gun props?

Thanks, David