Leica Trinovid 10x25 BC Binos Leather - how old?

[Scoob]

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Hi all

New to forum.

I just bought some used 10x25 Trinovid BC,  which have the leather covering, rather than the BCA Rubber version.

I just wondered if it is possible to work out the age from the Serial number? (Mine is 1433082)

This is what I have been told about them, not sure how much is accurate - please help if you know different:

Optical coatings or Phase correction in the BCs was updated about 1990?

Apparently an original single fixture was used for the neck strap originally, before being updated to dual side lugs - which coincided with optical update.

I am due to collect these tomorrow and would like to know if I am looking through the latest optical version when assessing them - (I am sure they will be good whichever)

Mant thanks

Scoob