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In addition I had automated searches running on e Bay for these 14 amp types - whenever one appeared for sale I would contact the seller, asking for the serial number.
9 out of 10 did - many thanks to them for their trouble and good will.
Compared to my estimate of the total made, that's more than one in forty.
It might not sound like much, but quite a lot can be deduced from such a sample.
This in turn 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.
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.Fender never replied, and the magazine showed polite disinterest.So, with my dreams of being A Published Author in shreds, I might as well make what I've got available to folks.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.