Argentine Infantrymen in Pickelhauben, c. 1910.
Each of these infantrymen, with their officer and NCOs front and center, wears a spiked helmet. The number on the collar is 7.
Actual Argentine Pickelhaube recently put up for auction, and an illustration from 1912 regulations. A leather chinstrap for enlisted men, chinscales for officers.
Page by Mark Conrad, 2011.