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Most of the fonts I own have the dollar symbol with only one vertical stroke, and sometime of those the stroke doesn't go all the way through the S shape instead simply projects from top of the S shape and from the bottom of the S shape.
But almost all old school typewriting machines have a double vertical stroke.
Most advertizements featuring price in dollars use a single vertical stroke. But, throughout the Hip Hop culture the double vertical stroke is most common.
So what gives? Which one is 'proper'?
FYI, from Wiki...
The best documented explanation reveals that the sign evolved out of the Spanish and Spanish American scribal abbreviation "ps" for pesos. A study of late eighteenth- and early nineteenth-century manuscripts shows that the s gradually came to be written over the p developing a close equivalent to the "$" mark
There is a theory that the dollar sign goes back to the most important Roman coin, the sestertius, which had the letters 'HS' as its currency sign. When superimposed these letters form a dollar sign with two vertical strokes (the horizontal line of the 'H' merging into the 'S').