I recently purchased a new bicycle (OfficePress, at Cycle Base Asahi). There was a front light included (under-the-basket mounting type), but I asked the staff to remove it as I use another light system.
Therefore, it's brand new (it has never been used).
Compatible hub dynamo: J2-A terminal 6V-0.9W
Weight: Approx. 2.8 oz (81 g).
It comes with its original cable and its screws, so it's totally ready to install / connect / use.