Is the earlier 1903 considered a Slater frame? I have seen that style with a weld bead on top of the tank, and I have seen it with no weld. just formed without the weld, did they make the Slater frame both ways? I have seen the 1903 with the Slater style frame with and without the weld. I really noticed it on the motorized 1903 when they use them for the gas tank. they were smooth on top, no weld. then I see them with the weld line down the length of the top of the tank. they looked original, so it doesn't appear they grounded the weld down. I'm just curious, mine has the weld down the top center of the aluminum tank. I don't think they used steel frames for the built in gas tanks did they?