Soldiers from Victorinox from 1890 until 1961 are almost always stamped "Elsener Schwyz" on the front and with the date of manufacture on the rear after 1921. So that's the first four soldiers in the left column starting from the top. Exceptions here would be if the knife was made for private sale (technically a Model 200) or if it was stainless steel instead of carbon (Model 200 inox). In these cases the front may be stamped with "Victoria Switzerland", "Elsener Schwyz Victoria", or "Victorinox". Private issue knives may have an "E" on the back, or it may be blank. As with all things dealing with hand made items, there are plenty of exceptions to be found, but the bulk of the knives I've seen follow this general pattern.
Starting in 1962 with the Model 61 soldier, the front is stamped "Elsener Schwyz Victoria" and the rear has the date. Since these are all stainless now, there's no differentiation for "private issue" or stainless/carbon knives. "Elsener Schwyz Victoria" remains the front stamp until 1973 when they change to "Victorinox Switzerland Stainless Rostfrei" on the front which lasts until they are discontinued in 2008.
Officer's knives (right column) are a lot more complicated. This is a very abbreviated version: since there was no army specification they had to follow, there's a ton of variation. Early models are typically either stamped "Armee Suisse", "Elsener Schwyz", or have the name of the cutlery shop that sold them on them. Later models are stamped "Victoria" and "Victorinox" starting in the mid 1930s. "Elsener Schwyz" disappears in the mid 1940s and "Armee Suisse" in the early 1950s, leaving "Victorinox Switzerland Stainless Rostfrei" as the standard by the late 1950s, at first with "Victoria Officier Suisse" on the back, and then just "Officier Suisse" from about 1974+.