TLDR: Fudan FM11RF08S

Bambu filament

NFC taginfo:

MiFARE Classic (MF1S50)
ID: CD:45:2F:C0
ATQA: 0x0400
SAK: 0x08

FYI these might be Fudan clones of the Mifare Classic instead of NXP.
Philippe Teuwen recently uncovered that there was a backdoor in these Fudan chips, a backdoor that at some point also existed in the NXP chip. 

https://eprint.iacr.org/2024/1275
https://github.com/Bambu-Research-Group/RFID-Tag-Guide?tab=readme-ov-file#proxmark3-fm11rf08s-recovery-script

Bambu filament uses fudan. 
FM11RF08S
Hence Doegox’s research came in a good time. 

But then the kdf was extracted.

Package

Die

NB1S22
V01