I see they are gold contacts. Did they come with Cherry switches as well or E-switch like the stock HAPP?
It might be luck of leftover stock. I recently finished a Street Fighter II CE cab for a friend and he bought HAPP Super sticks and the Comp pushbuttons were smooth on the sides with no markings but had cherry switches.
They came with the e-switches but I switched them out.I got a 20 shipped for 25$