Which Royal Crown Were They Referring to?

Royal Crown Cola.
Best By Taste-Test!
Now, this slogan was being used way before anybody thought of The Pepsi Challenge! But that's not what I want to talk about here.
My question is: what royalty did the crown belong to? There might be a clue in plain view on the 1936 bottle label.
There are pyramids in the background in the label design!
Does that mean to refer to the Royal Crown of Egypt? I'm afraid I don't know. But I'd like to!
Does anybody out there know more about this?
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The beautifully embroidered cloth patch measures 5" x 9.5" and was probably meant for a bottling plant worker's jacket or work shirt.
Regardless, it's a cool design!
Almost as cool as that 1936 label, which has always been one of my favorite advertising icons!