Impossible to answer without the serial number.
c.1967
@ 41 years old
@ 40 yrs old
Impossible to age without a sn. value range from 10-500 USD
1970; 75-400 USD
Impossible to answer without a serial number; 10-500 USD
The Model 10 was not in this serial number range, only the Model 60 and Model 651.
10-200 usd
@1961
1979
MOdel 10 or 12
42-45. Model 10 designation did not occur for another 12 years.