For your consideration, here is a Proedge Craft Mitre Box, no. 55330, for knife cutting 45 and 180 degree angles, in a sealed package, made of Aluminum, made in the USA.  

It measures 5 1/8 by 1 3/8 inches and is 1 inch deep.  There is a lip on the bottom for setting it on a table edge.  It has some wear and creases on the packaging.  There is something marked out with felt marker, under Proedge.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (403.221v-.9hc)