017 PzKw Ia - according to German reports (from Jentz), they were unpacked from crates only in June 1937 "due to insufficient organization" (now: 6/36).
Name was written as IA or I A (like in German OOB)
Size should be 2 - they were very low (and in IA variant also
low short) [edit].
The same should be in German OOB for IA and IB (and Spanish).
However, as I look at sizes of light tanks, I'm afraid that some are not coherent... Japanese light and medium tanks are smaller than others (the same in Japanese OOB) - is it a purpose handicap?
Type 95 Ha-Go (size 2) was relatively tall - 2,1 m, similar to Vickers E and T-26, although its pointed turret probably made it harder to be noticed. But much smaller Type 94 and Type 97 are of the same size 2.
However, size 3 is also Stuart, which was bigger and taller. On the other hand, when I look at this video, it doesn't seem that bigger...
https://www.youtube.com/watch?v=IptafdU5z6s
I have a chart of light tanks in the same scale, +/- 2 pixels
http://derela.pl/tanks35_SPWW2_PIBWL.jpg
Leaving apart light tanks, it seems however, that Type 97 Chi-Ha should be size 4 instead of 3 - and Type 89 size 4 or 5 instead of 3 (it was Sherman size...)...