It's not on it anywhere.
Both Beckett and COMC use this numbering. It's also the numbering shown over at Cardboard Connection, which means that was the way Topps "numbers" them.
According to TCDB guidelines, these should be changed to the numbers on the reverse. Additionally, as a reference to the other hobby sources, Note2 should include the number used elsewhere.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).