cylinder I.D.

[rgbai]

Can anyone tell me what this cylinder would be for it's a antique in 38 rimfire
i know it's a Remington but don't know what model.

 

[oldiron]

I'm waiting on a Remington New Model Police factory conversion. Should be here the first of the week. Pics of the cyl. look the same. I can measure when it arrives. Maybe I need a spare one.
Edit...This is the second time I've made a mistake, can't remember what the first one was.
My Police .38 will be a 5 shot cyl. Yours must be a Navy of some type.