Venner Ven-O-Set B22 time switch lamp adapter

Here is something rather interesting I picked up recently, which is basically the grandfather to all those cheap B22 timer adapters that were everywhere in the 1990's and 2000's. This version is huge, heavy and fully mechanical but still works perfectly, as is to be expected with something as high quality as this! I suspect this was made by the well-known Venner time switch company, which made many larger time switches for use with street lighting and other applications. Needless to say these are quite rare