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Vintage National, Valco and Vintage Supro Amplifier Products.
Note the use of "550" as a source code on these products.
In either case, the remaining 2 digits are the week of manufacture (01 to 52).
With this in mind, remember if the last two digits of the source-date code are greater than 52, you're not looking at the source-date code!
In 1967 (after CBS bought Fender), Fender bought a HUGE supply of pots from CTS. So guitars and amps made as late as 1973 can still have 1967 date codes from this huge 1967 stocking.
Then in roughly early 1963, they changed to CTS (#137) pots.
Till about 1961, Jensen was the only Fender speaker supplier.