This post is 9 hours old and I still don't see anything.
I'm sorry, but I ran out of mind-reading pills. I don't suppose that there's a chance we can look at some pictures of this supposed watch? However... I suspect there won't be any!
You should keep looking at ALL the other episodes. WHen doing Perry Mason, actor Raymond Burr HARDLY EVER wore any od his own accessories. Thanks to previous WTF posts, I know that the program's Property Master supplied Perry with the watch he wore. And after the cast wrapped up the filming of the final episode, the TV studio at 20th Century Fox asked Burr to return the watch to their prop department (which he did).
And since the watch belonged to the TV studio, God knows who made it! It was most likely just a generic Waltham, Bulova, or Elgin