Check your Gongs!

[Sargeguy]

Many of you may not be aware but there are some marked gongs that are prized among collectors of early phones.  These early cast brass bells have inscriptions inside the gong around the hole.  Those that are stamped A.B.&C.Co. are from the Ansonia Brass & Copper Co. of Connecticut.  Ones embossed "W&S" are thought to be from "Williams & Son" of Jersey City, New Jersey.  There are others stamped "Wilmot & Hobbs" that are from the Wilmot & Hobbs Gong Bell Manufacturing Company of
Bridgeport, CT.  I have found these on random boxes over the years, not necessarily early ones, so check your gongs!!!

[Pourme]

Were they used on all brands?