Looking for an early Hasler servo pendulum windvane which used a wooden quadrant and offset vane shaft which secured to a yacht’s stern rail.

https://www.leboncoin.fr/equipement_nautisme/2154158514.htm

Must be as rare as dodos these days! Not many were built before M S Gibb took over and made the stainless steel SP and MP gears (with which I was involved, draughting the components more than 50 years ago now).

[Actually, I'm not at all sure what's being offered. The second photo is of the latch gear of a Hasler SP small pendulum gear for boats up to 30ft LOA. The first photo is of a drawing of its predecessor, with offset vane]

If you really want this style of vertical axis vane and latch gear, I think your best option is to make one, as I did for Annie's FanShi, basing it on the largest cycle chainring I could find.

https://junkrigassociation.org/Sys/PublicProfile
/2757889/PhotoAlbums/4264