Shinkurostreet wrote: Arggrr, there are only machine dates... sorry, could we find them into package of each old item?
I don't think Tamiya would listed the release date on the package, as far as I know. The year of release date can be found on the user manual of each GUPs, but it would be difficult to find the manuals of the old GUPs on the internet.
Therefore we can't pinpoint the release dates unless we have the copy of older Tamiya News Jr. books (Vol. 62 and earlier) that weren't digitized.