I received this belt of ammo in the early 1970s as a Christmas present from my dad. I’m hoping someone can help me with its identification and age. It’s a 100 round belt and I believe it to be .50 caliber (?) training rounds. I’m not sure if it was for airforce training or ground forces, and whether it dates to WWII or the post war period. The bottoms of bullets are marked with numbers as are the metal links. Thanks for any information and comments.

Tom