Looks like it should date to around the end of 1949, maybe beginning of 1950. Look on the front of the lever and above the serial number for an oval stamp with 1 or 2 numbers followed by a letter. If the letter is an A, then 1949, if it's a B then it's 1950.
Don't have my notes with me, but think that's maybe a bit early for case colored rotor? Maybe not. There are some plain steel ones that pop up after the war, though.
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