The prices seem to vary with age and color, with the black ones with beautiful decals worth more if they are in good condition. The area of the country where they are on sale seems to be influential too; CA seemed expensive. They were also made in different places and countries. Mine is one of the last made, according to the Singer dating information; I bought it from the first owner for $46 in 1972. I have paid much more for that in service charges since then but I don't think it would be worth so much except to me. It was made in Scotland, so Singer said.