QuiltNama,
I used a site called "Tom's Inflation Calculator" {
http://www.halfhill.com/inflation.html } to calculate what your Grandmother's machine would cost in today's dollar. It would cost $4,004.81 according to their conversion.
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It amazes me just how much of a bargain some of these used sewing machines are when you consider what a new one like it, if one were made today, would cost. I'm surprised anybody buys the new plastic play toys at all.
Joe