Guessing its 1960's or maybe early 1970's. Looks exactly like the pix below with Ernie Banks in the 60's. Anyone who went to a Cubs game back in the 40's, 50's, 60's, and 70's remembers these guys at Wrigley Field.
As you can see from the pictures (taken from the internet, not included) you can see they also did White Sox, Bulls, and Blackhawks games, and security at concerts (Beatles, Elvis, etc.) and for movie stars like Marilyn Monroe.
They actually started in Wrigley in 1928.
There is the famous picture of them in 1938 - Homer in the Gloamin' - ushering Gabby Hartnett off the field to safety.
And they were there for the World Series in 1945 with Detroit and the famous Billy Goat Curse.
Some of these have gone for big bucks:
$270 at MEARS July 2018:
http://www.mearsonlineauctions.com/lot-121202.aspx
$179 on Ebay this past Janary, 2019 Ebay, different version of the cap:
https://www.ebay.com/itm/ANDY-FRAIN-...4AAOSwJclcOC04
Very Good condition for its age. Perfect for a Cubs collector, or any vintage stadium memorabilia collector....Don't miss out!
Asking $200 or best offer shipped