Indeed there is, I didn't notice that on the bottom till you mentioned it, it says...
20 then a circle with a sideways diamond, then 2 & below that is 9203-A
I'll take a photo real quick.
Thanks for taking a jab at it! Considering there's no markings, I was afraid no one was going to comment.
I'll definitely look into ketchup bottles and see what I can dig up! I appreciate it!