Back in October, the BVG put its collection of old buses out on some historic lines in honor of 25 years of transport reunification. The weather was perfect and it was such fun to ride around in the old-timey transport. This particular model was used in the late 1970s in West Berlin.
Here's a close-up on the front. This was one of the first "One-Man" buses, meaning the driver also sells tickets. Previously, there would be two BVG employees on the bus, one to drive and another to sell and validate tickets.