*The 'Preh' potentiometers used until the seventies had a two- or three-digit number following the 250K resitance value.
The first one or two digits were indicating the production week (of the pot), the last digit stood for the year. week 1968, 250K355=351965 For more information about that topic look here.
In the old days people simply could give Hofner a phone call and they easily made custom changes.
The Selmer company began importing Hofner guitars into Great Britain in 1958 however they did not import 500/1 violin basses until about 1963.
This can be a very rewarding exercise as not only the year of production can be found but also the actual day and month.
In the following tables I have used a little initiative to arrive at the probable serial numbers that are shown against the years before 1958.
When it comes to the 127/128/Club60, information is more ambiguous.
Year of introduction varies between 1954-1961, depending on source of information.