I just learned that there is a group dedicated to vintage Caterpillar service tools, and that Caterpillar made/supplied tools and tool boxes, some made by Snap On, Armstrong, and some by Blackhawk

 

https://www.acmoc.org/bb/discussion-d72/28472-vintage-caterpillar-tools?start=60

and skip the first 2 minutes and 40 seconds 

there is even an Antique Caterpillar Machinery Owners group, and tool focused forum and website

https://www.acmoc.org/