Question about OEM frame number stamping

[Clatterville trolley]

I have a frame that I purchased and was trying to identify what year it may have been originally. There are numbers stamped into the side of the rails that appear to be a part number, either GM or supplier that stamped out the frame rails for GM. However, under the part number I found what appeared to be a date 10 6 79 - frame looks for all the world like a 67-72 frame, but if that is a date code it wouldn't be a 67-72.
On top of the frame rail just behind where the steering box bolts in is another number with about 6 or 7 digits and one letter - is that the serial number / vin number?? Is that number keyed to vin on truck cab from factory?

Any thoughts, suggestions, ideas on who to check with?? Thanks in advance. Jay

[Towbiz]

Ending of serial number is stamped on top left flange near steering box .

[FirstOwner69]

Originally Posted by Clatterville trolley

On top of the frame rail just behind where the steering box bolts in is another number with about 6 or 7 digits and one letter - is that the serial number / vin number?? Is that number keyed to vin on truck cab from factory?

Those are the last 8 characters of the VIN. The number before the letter is the last number of the year.

[SS Tim]

On Chevys in the 67-72 time frame the partial VIN was generally stamped into the frame's upper left flange at the steering box and often under the cab.
Look for eight characters like this example:
9 year
B plant
800001 unit serial number

There are a number of threads to be found on this if you use the site search.

[Clatterville trolley]

Those replies answer my questions - Thanks so much for taking your time and sharing your expertise with me. Jay