✅ SOLVED 1970s Celtics Basketball Shirt with velcro on back. What's up with this?

[vscience]

I know absolutely zero about sports stuff. I found this old shirt while picking in a pile of junk this morning. $2 Anyone got anything on this Celtics jersey? Based on tag it is 1970s. It has snaps on front; clovers on both arms. And, strangely, velcro on back which seems to indicate a removable name? Why?

 

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[DCMatt]

Nice snag! This one sold for $300 at auction:

https://huntauctions.com/live/imageviewer_online.cfm?auction_num=38&lot_num=157&lot_qual=

 

[DCMatt]

This one has the name patch attached to the velcro:

 

[vscience]

Well that's amazing. And I was sort of thinking it might belong to the water boy. Thx!