I believe the drive unit to be over 100 years old. No packing for the gland. It's actually left over remnants that Jutta sells from Germany. The drive unit looked so lovely as-is so I bought it. I noticed it looked good on a 1950s Märklin single acting base (that engine warn and repaired as well) so I swapped the drive units. With the smaller boiler it warms up quickly when -13C. I just watch the sight glass.