I'm no expert on these (I don't service them) but I did take some time to look at the Omega Extranet. In searching the case numbers 196001, 196601, 1960001, and 1966001 all return no results on a query for information.
I then searched on the 1250 movement, and did a reverse search for cases - there are maybe 90 cases for these movements (2 different hand heights are available apparently) and none start with 196. Most are 198 or 398, and then there are some others, like these:
055BA726
055BA7282
055BA7264
055BC7264
So although clearly not all of these have 198 as the first 3 digits of the case number, the 196's are a mystery. I assume an Extract of one of these 196 cases would provide additional information.
Cheers, Al
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