That looks like a Police Positive that I used to have, that I traded to another member here.
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90% probability it was an off brand breaktop from 1880/90s... very common on the streets from the 1920s thru the 1970s.
Like this...
We thought grandpa got it from his brother-in-law. Maybe he spent some time on the south side of Chicago, although I never knew him to be a jealous man. And grandma's name is not Doris. Or Linda Lou...
https://photos.smugmug.com/photos/i-...-vJNHTxs-M.jpg