Mets Fantasy Logo c.1964

Folks claim it actually was on the Zip cars c.1964+. Others it was LIRR sanctioned promo material. Some folks indicate a fantasy item similar to hats, shirts, glassware, etc. NOT LIRR material...

Not one photo has ever shown this item on a car...
Anyone with promo material, flyers, schedule, ads, etc. to post, please.
Or, is it a fake LIRR item?

I recall something of the like with "Mr. Met", but never with the keystone. The keystone was largely hidden back in 1964.