15 cm incendiary?

[pzgr40]

In the past I read somewhere this was an incendiary shell. But what era, what country? And does somebody have a drawing or manual?

 

[AKON_]

Not incendiary – upon impact and the functioning of the base fuze, the ,,Übungsgranate,, (practice shell) does not shatter; instead, it marks the impact point with smoke and a flash emitted through openings in the body.
Base fuze: Üb Bd.Z.10 (Spandau)
Germany, approx. 1900–1930.
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Akon