It was a limited run of 38 chronograph and time/date models for the reopening of the Zurich Boutique. A kindly Purist told me that when there is a limited run for a boutique, VC make the number consistent with the boutique’s address, in this case 38 Bahnhofstrasse Strasse.
I saw a picture of this watch, with no explanation, in a Timezone report on SIHH in 2018 and then did some digging with the London boutique to find out what it was. The London boutique joked that they sold more of these watches than the Zurich boutique!
All the best,
Jon