Watch List notes:

SWEDEN. Alfred Nobel/50th Anniversary of the Invention of "Extra Dynamite" Uniface Bronze Plaque, 1929. ALMOST UNCIRCULATED.

By Sporrong & Co. in Stockholm. Dimensions: 41mm x 59mm; Weight: 58.62 gms. Obverse: Bust of Nobel left; in four lines below: NOBELS / EXTRADYNAMIT / 1879-1929 / NITROGLYCERIN - A.B.; Reverse: Blank. Edge: Plain. Light brassy-brown surfaces.

In addition to his discovery of dynamite, Nobel also invented a slightly safer (and cheaper) alternative in 1879 which he dubbed "extradynamit."

Estimate: $60 - $100