Trying to identify sign by age and use. It looks like it could have been mounted on a pump at one time. The white square on it is the size of a Leaded Gas Warning sticker. One sided metal sign and measures 16" x 11".
Thank you.

WAS a Pump Plate, but it's now a barn Hanger.

1941 to 1946

Would have been dated like this on the bottom. They made two version of each, mobilgas and mobilgas special. So a total of 4 versions. One has no outline around the horse and the other,like yours, had a blue outline. The did this for both mobil and mobil special.
Have to beware of repops as there are a ton of them. Small things can tip them off.
This is the first pump plate mobil used. The ones prior to that were decals. They also had a rectangle plate used around the same time frame.



Rectangle pump plate:

Thank you for the information. Its great to get help on this site from guys like you.