Fender twin reverb

I know it was made after '72 because it has a master volume knob, and before '80 (as it is a silver faced). But I would like to know the exact year.
 
I can't find any info on the Fender website.

The ampwares.com says;

"Unfortunately, for the older amps, we still are not at the point where we can give any kind of definitive dating scheme."

If you can translate the bar code the give it a go:

B 01349 (I think it's difficult to read)
 
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