Not one to waste a good model number on just a single device, Apple again recycles A1419.

For a unique identifier, this is EMC 2806.

At the rear of the iMac, we find a plethora of I/O ports and a lone SDXC card slot:

Headphone jack / Optical digital audio output

SDXC card slot

Four USB 3.0 ports

Two Thunderbolt 2.0 ports

Gigabit ethernet port