Bernina started using the serial number to indicate manufacture date in the 70s, and the first digit indicates the DECADE (1=70s, 2=80s, 3=90s, 4=00s, 5=10s). The second number indicates the year within the decade. Your 830 Record was probably made in the 70s and has a serial number beginning with 1. My 910 was made in 1983 and the serial number begins with 23. So yes, adding 60 to the first two digits is accurate.