🔎 UNIDENTIFIED Old car hub grease cap?

[cellerfeller]

Just dug this - 3 1/2" across the top, 2" high, 2 1/2" across the bottom. Inside bottom is threaded - looks like old grease remnants inside but dry and hard. Looks like a logo on the top - similar to Chevy logo. It reminds me of a car/truck hub grease cap from the 1920's. Does anyone recognize it or the "logo" on the top?

 

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[creskol]

Plymouth is the only one I recall having used a similar emblem. Here is a later version, showing Plymouth written inside the trapezoid.