These are the East German (DDR) scooter models made by Industriewerke Ludwigsfelde (IWL) back in the 1950s.
IWL's first production model named the Pitty was launched early in 1955 and 1956.
In 1956 IWL replaced the Pitty with the SR 56 Wiesel. "SR" stands for StadtRoller ("town scooter"), 56 is the year, and Wiesel is German for the weasel.
In 1959 IWL replaced the SR 56 Wiesel with the SR 59 Berlin.
In 1963 IWL replaced the SR 59 Berlin with the TR 150 Troll 1. "TR" stands for Touren Roller and the backronym "Troll" stands for Touren Roller Ludwigsfelde ("Ludwigsfelde touring scooter"), emphasizing the longer journeys on which IWL scooters were now being ridden. The "1" at the end evidently indicated that IWL hoped to develop a further model.
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