Lancaster Antiques has dated this piece to the 1910s.
The leather or rope strap is missing from the handle but the purpose made hole can be seen clearly.

The bell is made of the traditional phosphorous bell brass that created stronger brass for regular use and this is a slightly different colour than the brass at the lower part of the handle. There are no dark/purple marks on the bell, this is the reflection of surrounding colour with the camera flash!
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Lancaster Antiques has dated this piece to the 1910s.
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