This is an original box from Akro Agate.  It contains 50 No. 4 blue clearies.  No. 4 size is approximately 7/8".  The box measures roughly 4.5" by 9".  All corners are intact.  All metal fasteners on corners are present.  

I have seen these also in all red, all green, or all clear marbles in the box.  I also have a box with different print on the cover that has an assortment of clearies in it.