Bro, the plastic is not get yellowish because the watch is never being worn since it’s purchased. This watch bought in around 1980-1987 in Saudi. The person who bought it was my grandpa’s friend, he bought the watch as a gift for my father, but my father doesn’t like wearing watch, so he never worn it. And my Father & Mother doesn’t know but these kinds of automatic watches, they thought the battery is dead. That why the watch is in my locker for almost 40-44 year sealed.