I think what people miss is that the "tub" beneath the table (the bulky bit in the illustrations) which houses the one-piece cast-iron trunion is actually a one-piece iron casting on almost all of the pre-1980 AGS and AGP saws. The only exception I know of is the very early AGS 14in saw (which can be distinguished because it was the only AGS to ever carry a splitter as opposed to a riving knife - later AGS14s, post 1961 or so, were exactly like their smaller bretheren). Compare that to a Unisaw or a PM66 for rigidity. The post 1980 or so machines were actually a fabricated frame with the same one-piece iron trunion casting and the later machines are still being made today, albeit in small quanities
Phil