Seems to me the strapping would be the same length if it came like that.
I agree, not a shipping crate hammer. This type of hammer has been discussed on this forum before. I only know that because I have been here since long before the big crash a few years ago.
This is a carpenter's hammer, with nail starter made into it. You can think all you want to about what it is, that's just my opinion. Not exactly a rarity, but they do hold a certain interest to some hammer collectors.
Maybe ScottG will be along to offer his opinion, he IS the hammer guru!!