Any ideas what is it?

[sidnik77]

Could it be a star shell? Any ideas?

 

[MINENAZ16]

Not easy without details but looks like ww2 German bomb flare or photoflash.

 

[Alpini]

Most probably a "Mark 50 Luft" Skymarker flare.

Is it's end/front open?

 

[MINENAZ16]

Most probably a "Mark 50 Luft" Skymarker flare.

Is it's end/front open?

It's indeed the closest

 

[Antoon]

Here a drawing of the Mark 50 Luft

 

[jvollenberg]

Is there a difference between the LC 50 series of flares and the Mark 50 Luft? This is really not my area, but this one seems very similar to the LC 50 F.

Joe