Found this at my Great Uncles and seeing if I can find the manufacturer. Only marking are as shown...P.W. 1163 75.2 TO
Latin American Collection
World Coins that Circulated in Early America
US Gold Collection
I've never seen one exactly like that. If I had to guess, I'd say it has the look of a locally-produced bar from the middle of the 20th century. Late 1940s to mid-1960s. The kind that might have been made by a dental lab, or a photograph or X-ray processing lab.
I wonder if the "1163" could mean November, 1963? The fact that it says ".999" is a positive, as is the weight expressed in troy ounces.
In my experience, it would be hard to command any kind of premium for a bar like that. I don't doubt its age, or its weight or purity. But there's just not enough to go on to make it interesting to most collectors.
Good assessment and the 1163 as 11/1963 makes sense given then owner. He was a family doctor in Texas in the 60’s-80’s.
Interesting bar, Weiss pretty much summed it up.
It's got nice color for sure.
Pretty "cool" bar, I like it !!!