Baume & Mercier age determination based on year of manufacture Chronograph

We have not yet been able to find any complete documentation from Baume&Mercier regarding movement numbers and year of manufacture

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

1940 Chronograph Venus Cal. 170, 17 jewels, hand-wound, 18K gold

1942 Chronograph Landeron Cal. 48, 17 jewels, hand-wound, stainless steel

1945 Chronograph stainless steel, black dial, 17 jewels

1948 Chronograph Valjoux Cal. 72C, stainless steel, full calendar

1948 Chronograph Landeron cal. 48, 17 jewels, hand-wound, chrome-plated

1948 Chronograph Valjoux Cal 92, 17 jewels, gold-plated

1950 Chronograph Landeron Cal. 48, 17 jewels, hand-wound

1954 Chronograph Valjoux Cal 88, gold-plated, hand-wound

1962 Chronograph Landeron cal 149, 17 jewels, hand-wound, gold-plated

1962 Chronograph "Baylor", Landeron cal 149, gold-plated, hand-wound

Source: Wolfgang Salm "Wristwatches"

1988 Ref. 6102/099, Lemania Caliber 1883, 17 jewels calendar + moon phase

1990 Chronograph Ref. 6103/1715781, Date, Automatic

1992 Chronograph Cal. 2892/2, 40 jewels, date, automatic, stainless steel