Vintage Omega crown suited for model(s)??

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I got som Omega vintage crowns and this crown got my attention.
At first I thought it is for vintage Speedmasters and measurements somehow fit BUT those Speedmaster crowns (mainly ref. 2998) I am finding on line do not have this extra tube. As you can see has straight Omega logo.

Crown diameter is 6,8mm, total lenght (incl. tube) is 6,2mm, outer diameter of the tube is 2,5mm and inner is 1,85mm. Unfortunenaltly I am no able to measure thread size as I can not reach it due to the tube.

Any clue what Omega model this crown was intented to?