$67 in today's dollars is $438.19 according to the gubbermint bureau of labor statistics CPI calculator.
I expect guns, guitars, and things like that of quality brands to appreciate at 3% compounded. $67 in 1967 would turn into $239 in 2010 at that rate.
I bought a 1950 Marlin 336 in May for $165.
It should be worth $167.50 by now.