Does anyone know what years this ammo was made?

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John
SWCA #3401 SWHF #737

My guess would be in the mid 60's.

I shot those in the late 70's when doing felony car stops.
YES, the round did penetrate an engine block.
You had to be careful if you shot out a back window though.

I have one cartridge found in the box with a M581 bought from neighbor having a divorce sale many years ago . He used the rounds while on guard duty in the Air Force.

That style box was used from about 1962 to about 1970.

If they are gold colored LSWC, they were my carry ammo with Detroit PD in 1973.

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Metro Man

Not a collector but............

All my old lead tip revolver bullets that started to turn...........
a light Gray from oxidation have all gone down range.

The box might be worth more than the ammo, if not ripped and in good shape.

The boxes are too common to have any significant value premium. They are worth today about the same as what a couple of new boxes of the same caliber sell for. But the metal piercing box might be worth a bit more as MP handgun ammo is more unusual. You may as well shoot them up, if that's the purpose of your question. As earlier said, they are from the 1960s. If you PM me the complete lot number(s) I can probably date them fairly precisely.

Most post-WWII (through the 1950s) ammunition in common sizes will have some collector value premium, assuming the box is full and both the ammunition and boxes are in high condition. Pre-WWII boxed ammunition may be worth a more substantial premium, and the older it is, the more the premium. That assumes the boxes are full of original ammunition and the box condition is good. Shabby condition partial boxes (with some exceptions) of any age are not collectible. As is the case for most collectibles, rarity, condition and originality determine value.

BTW, the Winchester-Western MP bullet was different from the Remington-Peters design. W-W used a very heavy bullet jacket nose having a lead core, essentially a FMJ bullet with a thick nose, while R-P used a die-cast zinc alloy (called Zamak) solid bullet. The intent was to better penetrate car bodies, not body armor. I am unaware of any similar handgun caliber MP ammo being loaded today by anyone.

Caution, use ear protection with that ammo. It will have a high pitched crack that will damage your ears. The lubaloy rnds will lead a bore badly with as little as one cylinder full.

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dd884
JMHO-YMMV

The child safety warning was mandated by the Fed’s in 1962. I don’t see it in your photo, so it should be from the ‘50’s to the early ‘60’s.

Old AP handgun ammo is legal to possess and sell at the Federal level, but current production is strictly for LE & military. If that box is full, it’s worth between $80 and $100.

I wouldn’t shoot the Lubaloy ammo. It has a reputation for severe leading.

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"I also cook."

I have a lot of those Super X boxes from that era; some are still full, some I use for reloads. I like them because they remind me of when I first started shooting and hunting, and those were the boxes of the day. Have a bunch of the old red/green/white Remington boxes from that same era. They just make me smile, somehow. Nostalgia, I guess.