Just curious when you received that FTZ ii. Again, now I have two of them:
- Mid March 2022: 200171**
- Mid August 2022: 201400**
And I have a May 2021 FTZ, first version: 302673**.
The original FTZ from 2018 were manufactured in Japan with an 8-digit serial number starting with a 2. Later on Nikon shifted production to Thailand and the serial numbers started over beginning with a 3.
For FTZii, production moved to China and the serial numbers start with 2 again. Needless to say, Nikon must have sold a lot of FTZ/FTZii adapters.
All Z-mount lenses and FTZ/FTZii have 8-digit serial numbers and by far the majority of them start with a 2. Those Thailand made, 2nd batch FTZ are a rare exception with serial numbers starting with a 3.