This is my Gillette Techmatic Safety space-age "band razor" that uses an extended strip of razor steel, rather than discreet blades. You "change blades" by flipping a lever to advance the band from a small feed spool to a take-up spool. I got this in High school in 1968, it's been hidden among stuff my Mother packed away when I left home. Looks like it has 8 shaves remaining on the band if you want to use it.

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