DCM carbines are seldom seen in that condition. Most had been issued and used, some heavily, and had been upgraded.
The sight might have been installed at the factory, but all M1 carbines in U.S. service were upgraded in the late war/post war period to incorporate the adjustable sight and the bayonet lug, though some inevitably were missed in one or both upgrades, and those are more valuable than the upgraded ones.
Jim
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