"Perfect" 1/4 inch foot - Singer 237
What I think is kind of interesting/amusing -
The "all-purpose foot" - which is the only one that came with some of the Singer 237's that I have - is the one I use for that "perfect" 1/4 inch seam - as long as I have the needle at the center position setting.
The Singer 237 is an early 1960's machine that is considered a Plain Jane machine - but I am fond of them.