Zenith vintage crown

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Hi to all,
I'm not sure if I've presented this watch on this forum before but anyway here it goes. It's a watch that I love but I would like to get the right crown for it, I think he deserves it. Unfortunately I can't figure out which is the right one.
The measures are: case diameter 35mm
Movement is cal. 40 dating from around 1955.
Any help would be much appreciated.
Thanks!