Need Help with bottle from PA

[EmmaB]

I found this bottle in the woods in Pennsylvania and while I'm 99% sure it isn't anything interesting, I still want to know what it was used for. My best guess would be some sort of spice or sauce. It's 5 inches tall and the numbers on the bottom are 603 on top, 4 on the bottom and a P in a circle in the middle. Any help is appreciated!

 

[CanadianBottles]

Welcome to the forum! Maybe something like relish? Or chutney? It looks a lot like the chutney jars you can get today.