Hi, welcome.
It's difficult to pinpoint the precise year (I'd need to look into it further) but you will be looking at 1980-1985, probably in the middle-81/82/83 perhaps.
I don't think anyone has documented the exact differences as there are so many exceptions and variations to the rule.(Even the 844-2 alone has at least 2 known distinct dial designs!) Generally though the main identifier is the T-SWISS MADE-T at the bottom of the dial. You will also normally see the second hand as a wider tail than others.
Happy to see a photo if you can post one?
Many thanks,
Steve
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