You are correct. This is listed by Cole:
http://www.stampsmarter.com/feature...sicView.htmlsearch by subject and select "Machine"
Wait for the real machine cancel experts to check in. The type has nothing in common with postal stationery catalog numbers, it's someone else's catalog system. The Cole database has its own number for this and it's something different altogether. Again, the experts may probably know who assigned this number/designation.
A nice cover!