Vintage Heuer Carrera crown-tube size?? 60s ref. 3648s

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Hi guys,

Could any of you tell me what size the original crown-tube should be?? At the moment, my Heuer 3648s has a 3mm crown tube, which is making it quite hard for me to find a replacement crown.

I wonder what size it was ment to have factory .. 3mm or 2.5?

- Rasmus