These rounds were common a couple decades ago. They were sold as cheap shooting ammo, here in the US, but people had problems shooting them. So their provenance is questionable. What I’m writing here is “best opinion” not hard fact.
The 50 79 has features common to the early Igman .50 BMG rounds (Yugo). The unheadstamped ones are curious (still) as they have ink case markings, but no headstamps, which is unusual for the caliber. They could be most anything, but some of the construction features are similar to 1950’s vintage Italian production. I’ve always hoped some of our European members would be able to comment more authoritatively. Except for the Egyptian rounds, the key here is that these other rounds are most likely reloads, so as collectibles or shooting stock, consider them questionable.
Things are questionable here as while there are multiple countries of production, with decades of spread in production, these rounds all have the same projectile, with the same cannelures, the same shades of paint as color codes on the bullet. Not likely from that diverse a production. Tip colors are standard, but shades of the paint vary among years and manufacturers.