15 rounds box SC

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would say it is a polnish box of 7,9mm amo ? if i am right
that rounds are packed 1934 ? it is marked 9 KW 1934
and naboje SC what is mean with SC ?
THX for all opinions .

[klarkon]

Zakłady Amunicyjne "Pocisk" Spółka Akcyjna
(Ammo plant "Projectile" Joint-Stock Company,Warsaw )
Naboj z pociskiem ciężkim "SC"
( Cartridges with heavy bullet )
Partja 48
(series 48)
Data elaboracji 9. kwiecień 1934
(Date of manufacture 9th april 1934)

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Thanks klarkon well nice explain 👍 as usual 👋