@1961
The Model 10 was not in this serial number range, only the Model 60 and Model 651.
The first two digits in the serial are your year of mfg. Your Model 10 was made in 1970.
Can't be answered without a serial number.
@1967
1920
10-1000 USD depending on specifics. No way to age without the serial number.
1969-1970
1961-1962
1957-67
1974/75.
Made in 1968.
@ 1966