Help with Tyre Markings

I have obtained quite by chance the Tyre shown. Online research has told me which Aircraft it would have been fitted to, and explained most of the markings. However I can’t find find anything on the ones that seem to be specific to that Tyre. So if anyone can explain 5010/6cat &121D3873 I would be very grateful. Also under the ref number on one side it’s marked 25711 but on the other side it shows 25714? If none of those number state the date of manufacture, any ideas as to it’s age. Many thanks.