This Cornopean is nickel plated brass, and has a rolled bell.  It came to me with crooks for low pitch F (shown), G and high pitch G, but plays perfectly fine when a straight Bb or A shank is used.  I can only assume that it originally came with these, as well.

 

It is unmarked, although there is a 10mm circular soldering mark on the bell where a maker's crest might have been affixed, but more likely a music holder.  It has been suggested to me that this looks like the work of Gautrot of Paris.  If so, that would place its manufacture  c.1860-1885.

 

I got this horn through William Gribbon in Greenfield, Mass.