This tunic is actually called a Waffenrock. These garments can be closed at the neck(notice the hook at the neck).

The tunic is missing the Obergrefeiter Chevrons. I am suspecting that this is a mint tunic that someone added the extra two gulls to each tab as an attempt to upgrade the rank.

Due to the rank inconsistency, I would not expect to see this tunic go for more than 700 dollars.