This brochure came with an Inverto 18R I purchased from eBay.
There's no date on this but the 1937 Inverto 18 brochure lists these tools at costing $1.00 while the 1965 price list has them priced at $2.40. Based on the inflation rates during the period between 1937-1965, the price of $1.75 shown here would have been reasonable, all else being equal, in about 1950.
There's no date on this but the 1937 Inverto 18 brochure lists these tools at costing $1.00 while the 1965 price list has them priced at $2.40. Based on the inflation rates during the period between 1937-1965, the price of $1.75 shown here would have been reasonable, all else being equal, in about 1950.
High resolution (600dpi) scan for download:
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