Button deadend ????

[DoctorDan]

Curious if anyone recognizes the button on the top left. It has no back mark. Not sure of the composition but it doesn't seem to be brass or copper. The top center button has backmark "City Button Works--New York". Probably dated before 1923 because City Button Works moved to New Jersey then although I'm not sure if they changed the state name then. Smaller button below it has same face but backmark is "The Austin Co.--Providence R I". The button on the right I have no idea and it has no backmark.
Also, it seems the top center button with "City Works--New York" is a more common version. Any information on these button would be appreciated.
Thanks and good luck.