Frame numbers

My 1974 Commando frame has these numbers stamped on it. Vin # 850 313764 is on the ID plate on steering stem and also on the motor and tranny. I took frame and pieces to sand blaster yesterday in preparation for powder coating and noticed these numbers stamped on steering column. Very small numbers - 850 F105796 on one side and 00105 on the other. On the frame bracket that holds the coils, etc. is 064140. Anybody know what these numbers mean?

"850 F105796" is the actual 'frame' number.

http://atlanticgreen.com/commandoframes.htm

"00105" is a batch number or other factory code marking, its purpose is still as yet, unknown.

"064140" is the frame part number.

Thanks. I did further checking on this site and found the frame number information I was requesting after I posted. I will be more thorough next time before I post. Site has a tremendous amount of great Norton information. Thanks Guys.

My 1974 850 frame has all the same numbers with the exception of the F no. And lot no.

My are F108383 and 0131.

As easy as it is to change the vin tag on the Commando frame it is a good idea to write the F number on your title or somewhere to help provide proof of ownership if needed.