Hmm, I don't think so;
I bought 5 MC tins last year;
3 British Woods 100 gr tins marked 371611, 371509, 371?09
2 Bombay Extra 100 gr tins both marked 360209.
I suppose first 2 digits is the blend and last 2 digits is the year. Don't know about middle 2; batch number or something?