ID on WW1 German round, please?

ATOM

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german round.jpg

OK, a puzzle for the learned ones. I’m looking for an ID on a round. It appears to be WW1 German, either very light artillery or quite heavy small arms.

Brass case, rebated rim, Berdan primer.

Iron/steel projectile with copper obturation band. Slight bourrelet body. Quite a flat nose. No fuze, projectile appears to be one-piece. Inside is empty from the base, with apparent residue from some sort of combustion.

Overall length: 5.672”

Obturation band dia = 0.82”
Projectile max dia = 0.775”
Projectile length = 3.17”

Case length = 2.75”
Outside neck dia = 0.81”
Rim dia = 0.85”
Base dia = 0.89”


Headstamp Sorry, no close-up lens available.
12 o'clock: P&S,
9 o'clock: 77
3 o'clock: 18
6 o'clock: sp [over] 61
P&S believed to indicate Potz & Sand, Mannheim, Germany. Company seems to still be in existence, if it matters. 18 would likely indicate year of manufacture, consistent with that on projectile.​

Faint stampings on projectile: C inside a circle, 22 18, crown [over] V (latter repeated twice)

Any ideas as to what this might be?
 

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Looks like a round for the 2 cm (20mm) Becker Type 2 aircraft cannon. Possibly an incendiary version.

Link of interest for you here.
 
Great! I rather figured it for something like that. It's a good day when you can learn something new. Thanks very much.
 
Fun fact, the Becker was a direct blowback autocannon using advanced primer ignition to fire with an unlocked bolt, impressive for a 20mm caliber:

wzZO0aB.gif
 
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