Marting Standard model saxophones
Made 1935 - 1943 (Ser# 112### - 143###) Classification: Semi-Professional
These horns seem to be a combination of a Handcraft Imperial body (note the Eb vent key, below the low D key) and Handcraft Committee keywork.
The fact that these horns where produced at the same time as the Handcraft Committee and Committee 2 combined with some cheaper details
(fixed right thumbrest, no heartshaped left thumbrest) makes me think these are somewhat watered-down versions of the Imperial.
More pictures (click to enlarge)
Some characteristics (click to enlarge)
The keyguards of the low-B and Bb keys
The keyguards of the low-c key
The thumbrests voor left thumb (the right one is fixed as you can see on the keyguard pics)