Just trying to figure out when the picture was taken. Judging from the short hair, dark plastic rimmed glasses, thin lapels on the usher, Karl's hat and other's clothing, it was probably 1964 or 1965. By 1966, even slightly longer hair styles started becoming the norm and a year or so later so were metallic framed eyeglasses.
MET POWER, however, is a suitably radical late-60s message.
My guess its a takeoff of “Flower Power” so that would mean circa Summer of '67?
Looks like the revolution failed to reach the box seats.
I just wanna find myself one of those spiffy jacket-and-bow-tie (presumably in orange) that the characteristically cheery usher is sportin'…
FROM OUR BASEBALL LIBRARY
Piazza: Catcher, Slugger, Icon, Star by Greg Prince is available from Amazon, Barnes & Noble and other online booksellers.
Amazin' Again: How the 2015 New York Mets Brought the Magic Back to Queens by Greg Prince is available from Amazon, Barnes & Noble and other online booksellers.
Volume I of The Happiest Recap: 50+ Years of the New York Mets As Told in 500+ Amazin' Wins by Greg Prince is available in print and for Kindle on Amazon.
Faith and Fear in Flushing: An Intense Personal History by Greg Prince (foreword by Jason Fry), is available from Amazon, Barnes & Noble and other online booksellers.