Navajo Freight Lines Blue Eyed Indian Advertising Mugs

Up for bid are a Unique Lot of 4 Vintage Navajo Freight Lines Advertising Mugs....................
"Look For the Blue Eyed Indian" Inscription.
The bottom of the mugs have what appear to be Mold Numbers Embossed on the bottom as follows:
These items may have been made by the Anchor Hocking Company without the traditional Anchor on the bottom.
Mugs are 3 and 3/8 inches tall and hold approximately 8 ounces of liquid when completely filled.
Thanks for looking.