Sand Knit Tagging Question

[beantown]

Can someone shed some light on what range of years this tagging would have been used on Sand Knit game used jerseys?

Any insight would be helpful...thanks..

[sox83cubs84]

Looks like late 1970s vintage.

Dave M.
Chicago area

[both-teams-played-hard]

http://www.both-teams-played-hard.com/Sand_Knit.html