JDM tags are not encoded, one of mine reads EF8-10000xxx. So if you knew which factory the EF2 was made (Suzuka plant? Where the EF8's popped out perhaps?) and you found out how many they made a year then perhaps you could narrow it down.
For example, lets say they made 50,000 EF2's a year, that would put your car somewhere around the months of Feb/Mar 1990...
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