Prussian medal group with "battle bars"

[Paul L Murphy]

This is one of my favourite little Imperial bars, even though most of it is private purchase trinkets from the 1920's. I have two groups with these "battle bars", probably better described as service bars since they mention the general theatre of service rather than specific engagements. I am just curious if the more experienced collectors of Imperial items could advise on how scarce these bars are since I have not seen them turn up often ?

Paul