If you go to their website you will be redirected to zinnfigur.com This is the website of Berliner Zinnfiguren Kabinett, and they have a pretty large book department. There seems to have been some agreement, that they will take over the business of Christian Schmidt KG. So they might take in subscriptions which were placed with Christian Schmidt. Just ask them.

And, by the way, me too got my first naval book from Christian Schmidt in 1964 or 1965

Falk Pletscher