The Master website sure seems cruddy. Master makes a lot of locks that they dont list on the website...or at least I have not found the right combo of clicks to find them.
Speaking about the "commercial" locks, I have a master "commercial' No.1 lock that has a band around the top and one around the bottom...the one around the top says "COMMERCIAL" and the lower band says "Master". So easy to pick sometimes it just opens if you give it a dirty look

I swear all the pins in it must be the same length...the only tough part is it has a hour glass shape that blocks the cylinder..otherwise its the easiest lock I have ever picked.