I have had this in my garage for over 25 years.  I don't remember where or when I bought it.  The box says "Union" on it.  I can find no other Union boxes on the Internet that look like this.  Not sure if that is the brand or what.  Has no other markings I can find.  If anyone can shed some light as to what brand this is, I would appreciate it.

The box is 21" from side to side.  It is 9" tall.  Front to back is 9 1/2".  It weighs 18 pounds.

I do not have the keys.