I think I know the answer. Notice all the tractors sitting around. I'd bet a dollar to a donut this is the old VN remnants. Notice the word Yanmar is not used in the ad. 19hp tractor three point and pto
I'd say its bigger than a 1500 purely on rear wheel size. More a 1700 or so.
Are they all that tall and narrow? That looks like a 'vinyard special' its so narrow.I'd say it is a 1500 based on the configuration of the 3-pt hitch. I think none of the other models are built that way.