Picked up those 3 "Imperial" knights today. Not sure I've ever seen them before.
The horses have a single slotted base and each horse looks exactly the same.
Two of the knights have imperial style skirts, like that Marienburger shown above, with breast plates full helms, and a feathered headdress that sticks up and rolls down their backs, carrying lances which need to be glued on, as do the arms with shields.
The third figure is one piece, except for a cloak that can be affixed to his back. His shield has a raised templar looking cross on it, and he's in full body armor, no skirt, no helmet, sword arm in the air brandishing the blade. His air cut is like he had a bowl put on it.
I'll borrow someone's camera when possible, and put up a picture when I can.