From what I remember it was the "Standard" models that always had the serial number on the headstock - and the guitar in the OP's photos does appear to be an MIJ Standard.I also remember the headstock serial numbers on the original "Contemporary" line (the ones with the black headstocks), the "Contemporary Standard" line, and a few other miscellaneous MIJ models.
Non-Schumacher transformers – It’s been universally accepted that Fender only used Schumacher transformers on amps made in the 1960s and 1970s.We try to address both the musical and technical aspects of vintage fender amps.Our Buyer’s guide to vintage Fender amps will be valuable to anyone who is about to purchase a vintage Fender amp.I think in the corners of the boxes were older pots remaining from earlier dates... Like I said, there were 5 or 6 of us at the benches every day.
leftovers.” Regarding production he recounted the following information: “I think I remember being 'pushed' to come up with 30 of the simpler chassis (Super Reverb? But it wasn't always 'cool guitar' amps, sometimes I was making Fender Rhodes Satellite amps on bent aluminum, sometimes only Champs.
That looks like one of the Contemporary Series of Strats built in Japan.