Just came across this ...

[Shell Shifter]

Never saw anything like this in the wild so to speak...
I am guessing about 17cm projo?
Guy wanted $500usd but he would probably go to 200. He says he has a mint projo that fits it too.

 

[Shell Shifter]

No idea what it is?

 

[SG500]

No idea what it is?

Hi have you got a case length, rim diameter and confirmation of the caliber. Makes ID a bit easier.

Dave.

 

[Shell Shifter]

It was a sidewalk sale so measurement opportunities were limited. Case length maybe 4 feet. Doesn't the head stamp nail it?

 

[tigbrand]

Looks like a German WW1 naval case, the numbers on the base would id it. Can you get a proper pic? Some very knowledgeable members on here. I would think 200 dollars US would be a steal! The projectile wouldn't be common either.

 

[Shell Shifter]

Sadly those were the best I could do under the circumstances.
Looking at the basepic using my editing tools I see:

3/Juni 1918/Magdeburg/Sp4C6

I am going to see if I can get some pics of the projo. I at least had the foresight to get the sellers number