Could you try to fill us in on what is going on in your head, or stop babbling incoherently? The picture comes from a 1948 advertising brochure. You can tell by the clutch engagement rod being a pull lever under the handle bars. In 1949 it was changed to an over-centre locking lever on top of the handle bars. The model 30 ended in 1950 when they switched to the ABN. The ABN was a 4 hp whereas the AB was a 3 hp, hence the 30 & 40 designators. Waterloo never used a B&S, except on one model of the Supremacy line, and the Boy. Not sure how you get to 1952 or 1953, or what the Waterbury anomaly is.