Yes its a very good link and the only link I know of about these old utility/advertisement buttons. They were mostly used by shoddy tailors and textile makers.
My theory is a very long time ago a English immigrant was a grounds keeper at the state mentel hospital still had cloths that he brought over from England and lost a button on his long John's while working at the hospital..
Looks like you just got bitten by the History Detective bug...
Think you can prove your theory?
Public records, ancestry.com, hospital records... cmon girl, you can do this!
I been thinking about it all day lol my freinds parents work at the state mentel hospital I am gonna ask if they can get me old records for grounds keepers