Yet another Sasieni history lesson: The years surrounding the end of World War Two featured many changes to the Sasieni line, not the least of which was the death of Joel Sasieni in 1946 and the assumption of role of managing director by Joel's son, Alfred. Equally important are the slight changes in nomenclature and other details during the timeframe from 1944 to 1950. Sometime in 1944 or 1945, the florid pre-war Sasieni script is replaced with the more upright post-war Sasieni style. Also during this timeframe, "FOUR DOT" is added to the nomenclature. By 1946, the style of the four dots themselves change from an elongated "diamond" pattern to the current equidistant 'square' diamond pattern. By 1947, the condensor changes from a screw-in fitting to a push-in pressure-fit (most likely due to the expiration of the British patent; the US patent expired in 1942) and continues onward into the 1950s. By sometime in late 1947, the patent is no longer impressed on the pipe. Finally, around 1948, smooth pipes start featuring the finish name in addition to "FOUR DOT", so there was the "FOUR DOT STANDARD" (the old "plum" finish, phased out by 1958 or so), the "FOUR DOT NATURAL", the "FOUR DOT WALNUT", and so on. The Rustics have been stamped as such for years, so prior to this you would see "FOUR DOT RUSTIC" before the other finish stamps were employed. Other changes were to come, but certainly the changes between 1944 and 1950 offer the serious Sasieni collector a way to accurately date the age of a pipe to within a year or so.
Here we have one such pipe, and a pipe I know quite well (I am the first owner of it): A Sasieni Four Dot Natural (not stamped as Natural but you can tell) that can be fairly accurately dated to around 1947. This is due to the fact that it features the post-war script, but still has the patent number and has a pressure-fit condensor (rather than a screw-in) but lacks the "NATURAL" stamping. This pipe was one of the first pipes I ever smoked, and is part of the original group of unsmoked pipes I purchased from an estate sale back in 1994, which took me down an entirely new path in my life.
http://www.thepiperack.com/blue-chip-estate-pipe-sasieni-1947ish-four-dot-patent-worcester-from-my-personal-collection/