This technique, which belongs to the group of so-called Simulated wares, involved creating a simulated copper effect on a silicon body. Typically the seams, rivets and dents are recreated very realistically so that to the uneducated they appear to be copper until further inspection. 

Copperware was produced during two periods, 1887-1914 and 1924-6, meaning that examples do turn up but not regularly! 

Rare miniature versions do crop up occasionally as as with most things miniature, command a high price!