If I remember correctly, a mature moose's ears are about 13" from tip to tip. If that is the case, this moose looks like it would measure smaller than it appears.
I wouldn't be surprised to hear it was 49", and that all the other pictures are misleading.
My guess is 47", and those fish-eye pictures are misleading. Note that the antlers are standing on a log in the beach/vertical picture. I think those are a bunch of shorter men in the pics too. In my opinion, you can't judge antlers when they're already on the pack, so those bear little in my estimate. The most important picture in the bunch is the first one, where the head and ears are visible relative to the antlers.
I grew up with my dad's 68" moose track hanging in the garage... and this one just doesn't seem to be in that class.