gefmey
·Longines did do a great job on information for my 1928 silver watch which went to A. Baume in London
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I had originally gotten information that the 11.68z movement was made only in a single run and in limited numbers
Longines sold Wittnauer years ago to Bulova, and Wittnauer & Bulova names now owned by Seiko. When the watch was made, Wittnauer was Longines agent in the US and so Longines did not have any information of whether the watch was modified after it left Longines Switzerland and was sold by Wittnauer.
Longines sold Wittnauer years ago to Bulova
That is true, but there was a big difference between the old Longines-Wittnauer Co. (Longines US importer, formally known as A. Wittnauer & Co.) and the Wittnauer Watch Co. in Switzerland.
It was the Swiss watch company that was sold to Citizen/Bulova, not the importer which was out of business when that happened.
The Swiss Wittnauer Co. never would have had any records on your Longines watch, as these were separate factories, nor would they have done the conversion work.
It is possible that the US Longines-Wittnauer Co. at least supplied the parts for the conversion, but those records are long gone. The Swiss Longines factory never had access to them as they were separate companies.
Hope this helps,
gatorcpa