Yeah they ran a 16hp Briggs and this one is hydro so should be a Vickers. I don't know how to tell yet. It's a model 3416H H being Hydro I also have a 3416S S being shuttle which is a 4 speed. I am planning on reserecting one of them not sure which one probably the Hydro. As a point of interest there was an option in the states that used a hydraulic ram and draught control to raise and lower the deck and rear linkage assembly that was tapped into the hydros pump. They are a very heavy machine anyone curious should have a google around they had an amazing amount of attachments available in their day like buckets, grader blades, snow blowers, weed cutters etc and best of all the attachments changed in minutes with a few pins.