Sub-Zero Model Tag Location

Serial Tag Information:

The serial tag, labeled as the rating plate in the diagrams below, shows the following:

Model Number
Serial Number
Manufacture Date
Refrigerant Charge (Sub-Zero only)
Total Amps
Refrigerant Type (Sub-Zero only)

Classic (BI, CL), 600, 500, and 200/300 Series

Combination models:

Over/Under: Inside the refrigerator door near the top door hinge.
Side-by-Side: inside the freezer door near the top door hinge.
Classic (BI, CL) French Door: inside the left-hand door near the top door hinge.

All Refrigerator and All Freezer models:

Inside the door near the top door hinge.

Designer Column (IC, DEC)

Inside the middle drawer near the drawer guide opposite the hinge.
DEC Refrigerator models have four drawers. The rating plate is behind the middle two drawers near the drawer guide opposite the hinge.

Designer Tall (IT, DET), Designer Drawer (ID), and 700 Series

Inside the cabinet to the left of the upper drawer.

Professional (PRO) Series

PRO3650: Inside the cabinet to the left of the freezer drawer.
PRO4850 and 648PRO: Inside the cabinet to the left of the upper freezer drawer.
All information obtained and credited to Sub-zero at:
https://www.subzero-wolf.com/assistance/answers/sub-zero/common/sub-zero-serial-tag-locations