MARKED WITH THE INITIALS OF THE FIRST SILVER ARTEL AND RETAILED BY FABERGÉ WITH IMPERIAL WARRANT, MOSCOW, 1908-1917, WITH SCRATCHED INVENTORY NUMBER 18662

For a similar cigarette lighter shaped as a frog see H. C. Brainbridge, Peter Carl Fabergé (London 1949) plate 73, illustrated, now in Her Majesty The Queen's Collection.
It is common knowledge that fashionable functional items like lighters or bell pushes were either cast in silver or carved in stone.