Also check out the below image of "Clempert", drawn without much modification from a famous Houdini publicity photo. No wonder Houdini hated these guys.
According to Magicpedia, Houdini filed a suit against Clempert in England where variety acts were protected. Clempert apologized and promised not to infringe Houdini's rights in future. After Houdini's death, Clempert came out of retirement, but it was a short-lived revival.
Below are links to tales of more Houdini imitators.