Advice: Speedmaster 321 Chrono hand

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Folks!
May be i will be more lucky via this thread, does anybody knows the length of the original spear chrono hand (drop) (for 105.012 in my case). I know it should touch the minutes scale and service hands are shorter? Thx
 
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I recently bought a vintage chrono hand, since the current one is heavily eroded.
The vintage hand which I bought seems correct (~18mm) or should this be longer?
 
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I know it should touch the minutes scale and service hands are shorter?
Correct.