Zenith do not have any crystals for the A386 but there is a crystal maker in Germany who can make them to the original specification. I don't have any contact details for them, but I am reliably informed that the cost is about £60.
Yes lucky me I've found original handset + service handset (private seller on OF and chronotrader) as well as a crown (service) and plexy. The watch to restore is now at zenith Geneva for a quote (movement to service) cause my usual watchmakers don't have parts for a386. Hope zenith won't charge too much.. (Not so much hope) Wait and see.