This is a succesful attempt to make a great improvement in overall size. The London Dome was a very popular style with a myriad of sizes and differences in detail.
Sizes vary from a horn diameter of just over an inch to a big as 7 inches.
Expensive domes are silver plated and older ones beautifully engraved.
Materials include brass, copper and tin.
Later designs came in faux tortoise shell.
The 'swan' version is very pocketable.