ID that antique whistle

we're still on tube shaped whistles right ??

All the steps in place right ???

Now once again a 'comb over'……………………………………..and we are just looking at the tops…..

Cast top or two pieces, perhaps machined ??

Shape of the ring ??

Overlaps the sides or flat top ??

Raised ring or flush ??

Is the ring distictive to a certain maker ??

Same metal or different ??

Can you tell if the ring is Amercican, Australian, German, Chinese, India, Argentina  …..etc…..etc….

High quality or inexpensively made ??

Marked on the ring ??

Marked on the top cap ??

Hmmmm…..go on ??