M-2 Extensions. Shown here are 3 M-2 Extensions, The old logo extension on the top in 1936, the other two are dated E and E (WWII). The thrid one is marked on the hub in the modern way. Shown 4th here an M-60-E (WWII) extension and on the bottom is a Flextension M-61A 1939 – 1942

Extensions

M-2 Extensions. Shown here are 3 M-2 Extensions, The old logo extension on the top in 1936, the other two are dated E and E (WWII). 

The thrid one is marked on the hub in the modern way.

Shown 4th here an M-60-E (WWII) extension and on the bottom is a Flextension M-61A 1939 – 1942