Can anyone help me narrow down the date on the Casey Stengel Yankees Old Timers jersey in the Mastronet auction?

The auction lists it as
Offered here is a complete New York Yankees road uniform worn by Hall of Fame skipper Casey Stengel during a post-career old-timers game. This gray knit ensemble was quite possibly donned by Stengel at an old-timers exhibition staged in 1970 at Anaheim Stadium, as expense report records reveal the managerial legend to have made the trip. The button-down jersey boasts "NEW YORK" arched across the chest in blue-on-white double tackle twill and Stengel's since-retired (by both the Mets and Yankees) number "37" applied to the back in like fashion. Blue-and-white striped stretch ribbed cotton surrounds the sleeve openings and, situated within the cotton-lined collar, a "Wilson" size "44" manufacturer's label is sewn above a pair of strip tags that bear blue-ballpoint notations of "#37 STENGEL - SET 1 - 44-36." Graded A-6 by MEARS.
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The MEARS letter states it is "circa 1974-78"

A quick look on google shows Casey died 9-29-75, so I'm guessing that actually narrows it to circa 1974-75. Can anyone tell by the tagging and lettering style if it is closer to 1970 or 1974?

Here are pics





Any help is appreciated
Eric