Calibre is correct but not the name.
Ok, is it a colt conversion?
I don’t think so.
Is it for a merwin brae revolver?
Sorry, no it’s not.
Looking forward to this one, like Wombat I thought this was a Thuer cartridge, has every appearance of one but a different name? Interesting.
Got me stumped.
How about a hint?
.36 Geraghty
@Justice close enough, some people call it that.
It is a .36 Patent Revolver Cartridge for the Howe Patent Revolver.
Would it be a 577 / 450 ?
Kinda looks like it but NO it is not
Is it a .45 or larger?
.45 something or a rather
What about a 450 British Gatling?
Why yes SIR it is 
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Extra bulged 9mm parabellum?