I love Minerva watches old and new. My PE teacher was using a Minerva stop watch to time our 60 and 100m sprints. When searching the dedicated sources, I keep noticing that there are not too many vintage watches around. Does anyone have a reliable estimate of annual production volumes from the 1930s up until the so-called quartz crisis? Do we find very few of the 1930-1970s watches because production volumes were low or because too many of the watches were somehow forgotten, lost or not deemed worthy of keeping for the following generations?