Watch List notes:

SWEDEN. Alfred Nobel/50th Anniversary of the Invention of "Extra Dynamite" Uniface Bronze Plaque, 1929. CHOICE ALMOST UNCIRCULATED.
Dimensions: 41x59mm; Weight: 58.10 gms. By Sporrong & Co. Obverse: Bust of Nobel left; in four lines below: NOBELS / EXTRADYNAMIT / 1879-1929 / NITROGLYCERIN - A.B.; Reverse: Blank. Edge: Plain. Brown-bronze surfaces, with a few lightly scattered marks and some remaining brilliance underlying.

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

Estimate: $60.00- $100.00