This means that these 2 amp types can only be treated together for dates or production quantities when, as in this study, the serial number is all we have to go on.(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.I run a couple of websites making the schematics for these amps easily accessible.As people download them, I'm hoping they'll respond to my request that they send me their amp's serial number for this project, and many do.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.
Meanwhile I've offered this info to Fender US, Fender UK, and a US magazine.
I would have to collect data for ALL the amp types, just to work out how many were made of mine.
Then I became aware of the amazing work Greg Gagliano had been doing since the 1990s - the summary of his latest results are here - and that his research didn't take in the Rivera-era, or anything later. However for this range of amps at least, I reckon it's not just a policy of withholding company-confidential information. It's no criticism of Fender to suggest that they were too busy making great amps to keep records just so some amateur could use them thirty years later.
Could Fender make so many PRIIs, considering they were making the other 13 amp types in the range at the same time?
Then Soren in Denmark started showing serial numbers on his excellent Super Champ website (which is no longer on the web) - some of those numbers fell in between some of 'my' PRII numbers.