|Singer Touch & Sew 603|
As I've pointed out before, in discussing the Singer 600e, all Touch & Sew machines are NOT created equal. They are roughly divided into early 600s, which have metal gears and are comparable to the Slant-O-Matics, and the 700s which have nylon gears and are of much lower quality.*
|Singer 403 Slant-O-Matic - "semi-automatic" machine|
So, if you had to choose between a 600 or 603 Touch & Sew, just know they are both very fine machines, and you can't go wrong either way. My personal preference is for the 603, since I do have all the cams, and I am happy not to have the extra convoluted stitch pattern levers to deal with. I think the machine looks nicer without it.
|Pattern selection levers on 600e. I'd rather just use the cams.|
* Somewhere in the 620s is where this change took place, and with these machines the best thing is to look and see for yourself whether it has metal gears.
** The 600 "e" versions are identical except for the placement of the bobbin winder button.