Does the caliber 23-300 has overwind protection?

[Henkan]

The 23-300 is obviously a manual wind caliber and on my 2593 the crown is so small and also a bit recessed in the case that is is quite hard to wind. Hence I usually only wind it a few turns just to keep it running. A few times I have tried to wind it fully though but I always have to stop as my fingers get numb (it also takes quite a force to wind). I have wound it as much as it should be fully wound comparing to other calibers but the spring does not "tighten". Does the 23-300 have an overwind protection that makes the mainspring slip in the barrel like automatic movements have?

[Tony64]

Most of the manual wind movements do NOT have overwind protection (an exception being the new CH 29-535 PS used in Patek's 5170 chronograph)

Yours is vintage (and a beautiful watch by the way) so I would assume that it does not have overwind protection.

[Tony64]

Also, as far as I know the 23-300 was considered to be a terrific manual wind caliber and many still regard it more highly even than the cal 215 that's in use today. As much as I hate to say it (because Patek's vintage work can be a painfully slow process) it's probably time for a service.