Issue dates of Tamyia 1/20 F1 kits

[604_driver]

I have most of the various Tamiya 1/20 scale Formula 1 car kits unopened in the box. Are there any markings either on the box or in the paperwork inside that will tell me the issue date of that particular kit? When Tamiya "re-issues" a kit after not offering it for some time is the re-issued kit identical to the original or do they change some details?

[ZTony8]

Sometimes when the kits are reissued there will be a new kit number assigned.Usually this is when some detail of the kit is changed or added.Also- check the price.This is the 4 digit number next to the kit number.It's the price in yen.The lower the price,the older the kit.