What Are These, Revisited
 

This Leonard card is about the size of a 1951 Ringside, real photo, clearly vintage. It says "With All Good Wishes Benny Leonard World's Lightweight Champion." I'd guess some kind of promo piece.

http://photos.imageevent.com/exhibit...ard%20card.jpg

This stamp of Kid Lewis is about the size of a 1950 Bowman card, printed on paper with a gummed back. The right and left sides are perforated like a stamp, the top and bottom are machine-cut, which makes it appear that it was part of a strip.

http://photos.imageevent.com/exhibit...is%20Stamp.JPG

The Kid Lewis looks like it's from the "Sportsmen" magazine issue. May 13th, 1922. British.

It's listed on page 104 of "Seconds Out - Round One.

No idea on the Leonard. Odd that it's such a small size.

So it is; nice call Mr. B!