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There are some who would give you their daughters for that .455. Even though it's opened collector stuff.
You may find that Winchester loaded the 9mm a bit hot for a handgun. They may have been confused thinking an SMG needs hotter ammo.
The sub gun stuff is hot and stiff, I wouldn't shoot much in a handgun, though it would proabably be fine, worth more as a collectors item. I would love the .455, but I'd probably shoot it
I have an almost identical 9mm box. It has the same markings but the box is bigger, being square instead of rectangular. I got it from a collector who tells me it was made for the Lend Lease program of WWII. The ammo was designed for use in British Stens. My box is stamped 18 May 1942. Interesting thing is 18 May is my birthday .... albeit a few decades later.
FWIW I own a Sten MK2 so you should send it to me where I will reunite it with the gun for which it was originally destined.
I would be carefull about the 9mm. I don't know if that lot of ammunition is actually hotter than usual ammuniton (meaning more pressure) but some Israeli MG 9mm ammo is not recommended at all for pistol shooting and it says so on the boxes!! That said, the ammo probably just have thicker primers, for use in open bolt SMG's. A regular firing pin may have trouble igniting the primers. I once had a batch of .45APC ammo made for SMG use (the M3 Greasegun!) and it took an average of 3 primer strike to fire each round in my 1911! Not too fun! But the ammo did not seem any "hotter". It was a great way to find out if you had developped a flich!