UNKNOWN PITON # 51
c.1950s? 1960s?
YC Collection
UNKNOWN PITONS # 52
c.1950s? 1960s?
YC Collection
UNKNOWN PITON # 53

Piton found below Petit-Grand Dru Traverse.
Rab Carrington
UNKNOWN PITONS # 54

The three pitons in the photo are from the 1930s.
The pitons look homemade except for the right most piton which may be showing in the 1932 AAJ article as item H2. Photo accompanying Max Strumia’s 1932 article, "Old and New Helps to the Climber." Other pitons and ice pitons shown are also on the Unknown list.

UNKNOWN PITON # 55

from: Dan Langmade
UNKNOWN PITON # 56

from: Robert Nichols
UNKNOWN PITON # 57

c.1950's
YC Collection
UNKNOWN PITON # 58
Mfg unknown
c. 1950s
Photo from: vintageclimbing.com, gear for sale, 11/2023
UNKNOWN PITONS # 59
Mfg unknown
They look homemade
Shown on ebay 6/2023
UNKNOWN PITON # 60
Mfg unknown
circa late 1940s early 1950s