What SO box is this?

[xAZxE30x]

my grandpas neighbor gave my dad and I this that he got from a friend

any clue what model it is? It is in pretty good shape, all the drawers work amazing. Dont mind the clutter.. my dad has been moving the garage around

 

[nine4gmc]

KR5? something I think. It should have the model on the left side panel of the top box. That middle riser is sweet!

 

[bobcatdan]

Mid to late 50's, I'm not sure of the model, but it is a somewhat common one. The middle box to the right guy is in high demand. A guy by me has had the exact same boxes on CL forever. He has a crazy high price of $450 on them.

 

[mvptrukin]

I think it's KR56 (top box) and KR420 ( middle box) at least in everything I've read Snap-on didn't start making their own boxes until '58/'59 so there might not be any date or model # stamped on the back. But definitely '50's like already mentioned, here is a link to an old catalog page:
http://www.collectingsnapon.com/catalogs/catalogs.php?loggedin=0&catalogPage=1444