Bucherer age determination based on the year of manufacture of chronographs

We have not yet been able to find any complete documentation from Bucherer regarding the movement numbers and the year of manufacture

However, subsequent dates for the market launch of chronographs allow for a determination "not older than ..."

1955 Chronograph full calendar, moon phase, Landeron cal 186, hand-wound

1960 Chronograph Venus Cal. 210, hard gold-plated, date, hand-wound

1964 Chronograph Landeron Cal. 187, date, hand-wound

1966 Chronograph Valjoux Cal. 7733, hand-wound, gold-plated

1967 Chronograph, Landeron Cal. 248, hand-wound, stainless steel

1968 Chronograph Landeron Cal. 248, hand-wound stainless steel

1974 Chronograph Valjoux 7733, hand-wound, stainless steel

1984 Chronograph 9803, Lemania 1340/Omega 1040

1986 Chronograph Valjoux Cal. 7750, stainless steel, moon phase, date, automatic

1990 Chronograph Lemania Cal. 5200, hand-wound, limited edition of 200 pieces

1992 Chronograph ETA Cal. 7750, stainless steel, moon phase date, automatic

Source: Wolfgang Salm "Wristwatches"