Year of fuel tank

[78-911SC]

Is there someplace that a stamped date can be found on a fuel tank? If no is there a way by looks or stamping to tell what range of years it was produced? Maybe color, shape or other markings.

[E Sully]

I've never heard of a date stamp on a steel tank, just the plastic tanks and level sending unit. Early SWB tanks had a smaller vent tube than early LWB. I believe early LWB tanks may have been black, and around '71 light grey or olive. Later tanks with CIS swirl pot have a strainer in the bottom. First year 1973.5 have full size spare, 74 on space saver.
65 and 69 gas tanks
Porsche 1973.5 CIS fuel tank

[78-911SC]

Ed thanks for chiming in. I'm fitting this tank into a 70T and trying to verify the year. Believe it's a 22 gal. Maybe a 1984 but not sure.

[E Sully]

Same tank was used for '74-89.