CHERVON NORTH AMERICA 3M SPT77W-22 Worm Drive Heavy Duty Corded Circular Saw, 7-1/4"

What is the difference between this model and the W-21 model?

Does this saw have a skyhook?

Is this model shown in the picture or is this the new current model?

If i purchase this saw will i bee receiving a saw exactly the same as depicted in the picture?Older more reliabe2 handle bolts on top and 2 on bottom