"Show Mar in chains"

This is a photo I've had in my scrapbooks for decades. It was given to me by my grandfather when I first become interested in Houdini. On the back is written: "Show Mar in chains. London." And that's all I know! So I figured it was time to share this image and see if anyone recognizes this English street escapist?

By the way, notice how no one in this photo is actually looking at him.

UPDATE: Chris Gower over at the GEO (Global Escapology Organisation) Facebook group believes this photo shows long-time Tower Hill street performer Johnny Eagle (shirtless man in background) and his assistant Johnny Kedeno (or Cadenno) as the escapist. Chris says: 

Johnny Eagle was the speaker and would get the audience, he would show his strength by bending a piece of 1.5 inch by 0.25 inch steel bar simply by hitting it on his forearm. He had the ability to take the 30 foot of heavy chain and crack it like a whip. His assistant Johnny Kedeno had huge wrists and standard pair of Hiatt 1960 cuffs would not fit him!

Thanks Chris!

Related:

• Lifting the lid on Sergeant Houdini
• Houdini gives the all clear to his imitators???
• Those tricky Houdini imitators