That site uses the same data as the others
This might be of interest:
https://www.miata.net/faq/registrations.html
Japan monthly sales:
https://www.miata.net/faq/production/MazdaMX-5_MonthlySalesJAP_CY1989-2006.pdf
Interestingly, for 1991, the numbers are production numbers, not sales. When the ânewâ model came out in September 1991, Mazda cranked up production, in order, I suppose, to build up dealer stock. But Mazda might have overcooked things, because less cars were sold in 1991 than 1990, in Japan (Mk1 sales tailed off quite quickly). So in that context, it might not be surprising that the car was built in September, but not registered until 1992.
In Japan, production of the Eunos Roadster started in June 1989, in order to build up stock for the September 89 launch, with the first Eunos Roadster being NA6CE-100021.
In September 1991, there was the first significant update; the rear subframe brace was added, the power window switches were changed (unique for Japan). Because ABS was becoming an option, by then the slam panel was changed; previously the passenger side was blanked off. But by then (maybe before), it was opened up, to allow fitment of a screen wash bottle on ABS cars. Those late 1991 cars were onto the third version of the B6ZE engine. Early engines were so-called short nose crankshafts, the infamous âLWSCâ (an in joke: Light Weight Sports Crankshaft), many of which suffered premature failure. In early 1990, this was replaced by a crankshaft dubbed âLong noseâ. In mid-1991, which would include your car, the crank was changed to the âbig noseâ crankshaft. This was the last crankshaft change. Around about that time, the black V-Special was launched. So this model was mid-life before being replaced by the 1.8 model in August 1993.
October 1991 brochure
https://www.atelier-nii.com/cars/rs_catalog/jp/1991_10jp_Roadster_brochure.pdf
Nearly all of the really early cars are in the US, since the model was launched first there. I say nearly, because somehow a preproduction car, which should have been scrapped in the US, and was never road legal there, ended up in the Netherlands. It went on the market a few years back, and had some really strange differences (eg. the airfilter box wasnât plastic, but metal).