1942 Omega CK2287-1 27 C12 T1 - Sweep Chronograph Hand Accuracy

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1942 Omega Chronograph 27 C12 T1

As far as I understand, Omega chronographs from the 1940s typically featured heat-blued steel sweep chronograph hands.
The hand currently fitted on my watch is of that type; however, it is approximately 2 mm shorter than the original.

I should clarify that I am not assuming the „original“ hand was black based on a single photograph; rather, this conclusion comes from having seen multiple period examples of this reference fitted with black sweep chronograph hands.
Given this, which option would you consider more historically accurate:

a slightly shorter heat-blued hand, or a correctly sized black hand?

Any insight, references, or period examples would be greatly appreciated.

Cris