Toronto, Canada - "Manfred and Klaus"

Title: Toronto, Canada - &quot;Manfred and Klaus&quot;
Description: On the back of the picture where he&#039;s in fencing uniform, I don&#039;t know what the &quot;1B&quot; means . . .
File name: aah.jpg

On the back of the picture where he's in fencing uniform, I don't know what the "1B" means . . .