Polerouter 22017 - Period correct crown and dimensions.

Hi all,

Just Wondering if anybody could tell me the correct crown/ dimensions for a Polerouter 22017-4 ( and 3).
From my understanding, some models of the Polarouter may have come with an unsigned crown within the second execution, but were these crowns carried on to the early Polerouters as well?

Quite a bit on the forum already, but I haven't managed to find the correct dimensions for the correct crown.

Thanks!!

Your Polerouter should be a reference S20217/4 ie with the S prefix. Is that right?

As far as I’m aware, all Polerouter crowns were signed (as were Polarouter crowns in my opinion).