Differences between Speed Six and Service Six.

[Thegoodjohn]

Please I'm very confused, what are the differences between the Speed Six and Service Six? Do all the Speed Sixes have round butts? Someone should please enlighten me, I'll appreciate..
Thanks

 

[CCH]

Round butt for the Speed and square for the Service is pretty much it. There were some 3" Speed Sixes made, and I don't think the Service Six came in anything but 2 3/4" and 4".