The footage, released by Corriere della Sera on Tuesday, shows a couple walking into Larky bar and ordering a coffee.
The woman then casually walks to the door to check the coast is clear. On her return her accomplice reaches for the tip jar; the barista turns around but fails to notice.
The thief is successful on his second attempt, casually putting the jar filled with tips saved since Christmas in a paper bag.
The pair appear to be in no hurry; enjoying their Saturday morning coffee while another customer is served.
“It’s incredible, I was sitting there and I was duped like an idiot,” co-manager Severino Lavanga told Corriere.
“They were just normal people. Even if I had seen it I would probably have thought it was an optical illusion,” he said.