If it is not listed as an exception on the Unique Matchmaking Chart, the default rules above apply. Take, for example, an Pz.Kpfw. 38 (t). It doesnt have unique matchmaking. Thus we go find the row for Vehicle Tier 2, Light Tank, and see to the right that this vehicle can fight in battle tiers 1, 2 and 3.
Matchmaking Chart - posted in Archive Tanitha posted it over in the US Test forums but no one did it here so.. there you go Changes.