Avedis Zildjian were latecomers starting in 1994. They encode the year plus what I've called batch number.
www.cymbal.wiki
I've since heard the batch number called an oven batch from another ex Zildjian worker. The makes sense if you think of how the production system works.
Paiste brought in serial numbers during 1972. They encode the year but don't give specific model info. This is one of the reasons we have much better info on Paiste. The other reason is the dedicated team who work on the wiki. Thanks guys.
www.cymbal.wiki
I don't know of other major cymbal makers who do serial numbers. Agop did some serial numbers on a few lines some years back but it didn't seem to catch on generally with them. Among the independents, Matt Bettis has the year encoded on his cymbals, and Mike Skiba (RIP) had a serial numbering system on his cymbals he made from blanks. Craig Lauritsen started out engraving both weight and date under the bell along with his signature. I've got a set of those. Later on he stopped putting the date on, but post October 2011. There may be others doing it I don't know about.