US bomb - what type?

[eam59]

I found this at an estate sale and believe it is an American made bomb. I was curious if this is a training type or as would have been used for actual bombing. It is about 3 1/2' tall and is surprisingly lightweight. Any information would be appreciated.

[WWIIBuff]

It's a 100 lb practice bomb. Nice find.

[klarkon]

MK-15 mod.4 PRACTICE BOMB

[eam59]

Thank you WWIIBuff and klarkon - you guys are great.