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On that first tire I would exclude the decade 90-99 because at that time it was already mandatory for all tire manufacturers globally, to use the 3 digits, plus the triangle to differentiate the 90's from the 80's. Manufacturing date code then would have been (487<)
As for being safe... well...
Look what is placed in the oval, only! After 2K it's 4 digits: first two = week; second two = year.
Or post a pic of what you see and we may be able to help.
G.