Unresolved mystery shell

[frijoles108]

Found this intriguing shell post and it is a facinating design with the drive band. Don't know if you guys know this shell. Here is post http://www.warrelics.eu/forum/ordnance-ammo/massive-artillery-shell-identification-help-268429/
Here is a photo of shell.

Sent from my SM-G920P using Tapatalk

 

[frijoles108]

Hopefully the photos show up

Sent from my SM-G920P using Tapatalk

 

[silent knight]

It's a german 15 cm Gr. 12. Verstarkt (reinforced)
It can be found with one (copper) or two (copper and zinc) driving bands
Fuze can be Gr. 04 or Gr. Z. 17

 

[frijoles108]

It's a german 15 cm Gr. 12. Verstarkt (reinforced)
It can be found with one (copper) or two (copper and zinc) driving bands
Fuze can be Gr. 04 or Gr. Z. 17

How much is one worth in this condition? Are they rare?

Sent from my SM-G920P using Tapatalk

 

[frijoles108]

Also this is in fact a ww1 era shell correct?

Sent from my SM-G920P using Tapatalk

 

[silent knight]

Also this is in fact a ww1 era shell correct?

Sent from my SM-G920P using Tapatalk

Yes, it's WWI era