Those pattern numbers should be there, but very tiny, only 1/4" tall. They would be about where that #4 is hand written in your first picture. Could be worn off though. I think the price written on that first picture would about be the top of the market, to me anyway. Made by Griswold for Andresen, it is an acorn hinge, variation 2 of those made by Griswold for Andresen.
I've attached pictures of the numbers. They are missing on most irons that have had much use at all.
Tom