Yeah, probably 16 AWG.
Looks like the "Pro version" of the 3-outlet-to-6-outlet-16AWG-SPT2-extension cord conversion I've seen. They just left out the box but twisted and taped the wires. One seen in a friend's kitchen and one at a high school. Just took 2 of the $1 16AWG zip cord things with 3 outlets andf modified as mentioned above.
Maybe it's imported stuff which uses 3x1.5 mm2 cable with rather skinny insulation
Would be the typical cord for such power strips here in Europe, rated 230V, 16A. (Ratings of stranded are one fuse/breaker size higher than solid, i.e. 1.5 solid = 10A, 1.5 stranded = 16A)