The penny dropped fairly quickly, for Howard, regardless what else he was, wasn't stupid.
Generally.
"Of course, yes! You're one of the dopplegangers," he said, slowly nodding and holding out his hand. "I'm Howard, and I knew Steve, and Peggy, back in the days... " He waved a hand before moving to fill his coffee cup again. "... when we were back in those days," he finished with a laugh. "Good to meet you Colin," he finished, holding his hand out to the man.