WW1 75mm Shrapnel Shell - complete- painted-inked.

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I had to have this one, I have never seen one complete. Fuze pristine and disassembles, Fuze protector ( it fits onto the projectile nose with the fuze removed sealing the contents- for shipping?) has a crack, Case-has primer and primer tube. Projectile-a dark reddish brown with alittle black at nose, inked 75G-H, pristine driving band, with pusher tube.
Markings: Fuze, "Model 1907M 73 3 51 15, Lot 4324 18".
Brass protector, " Model 1907M, Lot xxxx".
Case headstamps, " crossed cannon, 781 ACCO 6 3, Am lot 781-89H 75MM GUN".
Projectile, Black inked " 75G-H",large flaming bomb " U 291", small flaming bomb "35". Base has large flaming bomb.
Posted for reference and comments. Also, the body lathe turning marks crisp, larger than the other one I have.

 

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I forgot to mention I purchased it from EBay, how the eBay Nazis missed this one is puzzling, no other bidders, listed under Korean War era, that may have had something to do with it.

 

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Here it is assembled, with a coat of Renaissance wax applied.

 

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I had noticed the original black ink mark is " 75G-H". I was wondering what that inking would mean as all I have seen on original shells is "75G". I assume the "-H" would mean applicable also to howitzer? Was the 75mm gun ammo interchangeable with a 75mm howitzer? I have no idea about WW1 howitzers or even if we used them in WW1? All thoughts appreciated.