Dating a fender amp by serial number
One run of Princeton Reverb II serial numbers seems to stretch from 1984 to 1986 with just a few from 1987, yes 1987, when some 220V models were still being shipped to Sweden and the UK.So if you'd like a bit more detail on an amp in that category please get me the speaker date codes, not just the serial number. Upon arriving at Fullerton, any one of these chassis might be built as a Champ II or a Bassman 20, in a process which appears semi-random when tracked only by serial number.
(Fender did this chassis-sharing thing in earlier years, with the same implications for guessing quantities, as noted by Greg Gagaliano.) I estimate about 5500 were made in total.
There are a handful of amp types for which I'm still running the searches because I don't have so much data for those (mainly in the solid-state range).
In addition Greg Gagliano sent me the Rivera-era-relevant numbers from his huge research info, for which, along with his friendly encouragement over several years, I thank him.
Certainly the hundreds of people who have helped me seemed keen to know.
Meanwhile I've offered this info to Fender US, Fender UK, and a US magazine.