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Both the Asahiflex I and Ia (which was not a manufacturer's designation) had a non-returning mirror, the main differences between the two models was (for the Ia) inclusion of a second flash terminal (giving both FP and X sync) and changing the slowest speed from 1/20 to 1/25 sec.
The instant return mirror came with the Asahiflex IIb (which as noted above, came before the IIa). With early IIb's the mirror did not return until the shutter button was released (as you have noted) and this was later corrected. Wikipedia is the only reference I have seen to this change but I have both models that are otherwise identical.
This article is within the scope of WikiProject Photography, a collaborative effort to improve the coverage of
photography on Wikipedia. If you would like to participate, please visit the project page, where you can join
the discussion and see a list of open tasks.PhotographyWikipedia:WikiProject PhotographyTemplate:WikiProject PhotographyPhotography articles
This article is within the scope of WikiProject Brands, a collaborative effort to improve the coverage of
brands on Wikipedia. If you would like to participate, please visit the project page, where you can join
the discussion and see a list of open tasks.BrandsWikipedia:WikiProject BrandsTemplate:WikiProject BrandsBrands articles
Both the Asahiflex I and Ia (which was not a manufacturer's designation) had a non-returning mirror, the main differences between the two models was (for the Ia) inclusion of a second flash terminal (giving both FP and X sync) and changing the slowest speed from 1/20 to 1/25 sec.
The instant return mirror came with the Asahiflex IIb (which as noted above, came before the IIa). With early IIb's the mirror did not return until the shutter button was released (as you have noted) and this was later corrected. Wikipedia is the only reference I have seen to this change but I have both models that are otherwise identical.