Old Low Convex Button ID Help

[West Jersey Detecting]

I dug this button in a local modern schoolyard that I had a hunch would have some old finds based on its location. I was getting ready to call it a day with a pocket full of clad when I dug this button. It is definitely a "0", but is the first digit a 1 or a 4 or something else?

Any help on ID is appreciated!

 

[Breezie]

It looks like the letter "H" to me. Could you clean it a little better and repost another pic? Neat find, Breezie