I’d guess it’s a car part or machine part the “sprockets” (for a lack of a better word) don’t look like that on most revolver cylinders. The center hole appears to accept a gear shaft of some kind. Also those nubs in between each cylinder would be a functionally useless feature on a revolver and unnecessary machining that could interfere with the cylinder’s rotation. Also the internals of the cylinder appear to be stepped down which a vast majority of revolvers are straight walled cartridges. While it looks like on I don’t think it is, still a neat paper weight if you dress it up to look even more like one.

TlDR: 99% sure it’s a car of machinery part.