German shell case ID

[reccetrooper]

Local antique shop has two Karlsruhe shell cases, one dated 1904, the other 1915.
Tapered straight wall.
Case mouth internal diameter appears to be 102-104mm (measured with a tape measure)
Case length is 650mm from inside rim to case lip.
Cases don't appear to be dented or overly polished. Sorry wasn't able to take photo.
What are they, and what is approx value?

 

[rigby]

I think this are 105x655 R for the Navy Gun 10,5cm SK L/35.

 

[reccetrooper]

Anyone have a ballpark idea what one of these cases is worth?

 

[Michel]

If it's a Kaiserliche marine case it should be marked M with a crown on top of it. In the Netherlands they can be bought at the 30/50 euro mark.