Not specific to Maverick and Comet, but I have never seen one of these before! http://www.ebay.com/itm/Vintage-nos...t=Vintage_Car_Truck_Parts_Accessories&vxp=mtr
Those used to be quite popular back in the 60's. I remember that we used to give them out to our customers. Ours, of course, had our logo on it.
Love that phone number! Reminds me those "old" days...our phone number when I was a youngun back in Cobleskill, NY in the late 50's was 800.