Congratulations, JP. Perhaps having my TT101 in your shop had something to do with your pursuing the new purchase. So far as I can tell, the finish on your escutcheon (the decorative rim that shows above the plinth and bears the switch panel) is the same as on mine. Yes?
I'll check my SN and report it here.
My TT101 was an "export" version, in that it can be adapted to work on 100V, 120V, or 220V, by selecting among power transformer primary windings. I read that these were sold to US service men stationed in Japan, probably among many others who needed other than 100VAC.
Although my TT101 was not NOS, it obviously had had very little use prior to my purchase of it. Possibly this is because the tiny crack in the PCB, that was causing it to fail intermittently, plagued all previous owners, as well as me, until JP identified the problem and repaired it.
I was in NYC for Thanksgiving and several days thereafter, and I thought about bringing you (JP) my SP10 Mk3 PS, so you could install your chip and re-calibrate it, but in the final analysis I figured it was best to send you the PS, when the time comes. Meantime, I have no problems with the Mk3.