In the city I am mostly missing priority signs. They are used at almost every intersection because if missing, right-hand-priority applies and that is common only in narrow streets inside purely residential areas. The very common signs are also
route indicators. These should be before any crossing, where one of side streets leads to another city.
Lines indicator too, if there is more than one line.
Do not forget to add start- and end of the city sign. That should be sufficient as you are creating old-looking city.
One more sign you could use is
soft verge (similar to strassenschäden in german), but as this seem to apply on whole city, you could just hang this sign below the start of city sign and do not use it inside of town.