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The special in this instrument chronograph is the DIAPAL Technology.
First developed by SINN in 2001, it is now in successful practical use. The
starting point for our considerations back then was the critical feature
of every mechanical watch: the aging of the oil, particularly around the
Swiss anchor escapement, and the accompanying adverse effects on the
accuracy of the movement. Theoretically, it was only a small step from the
analysis to the solution: where there’s no oil, there’s no aging. However, this
concise expression required numerous tests in practice. The technology is
documented by the DIAPAL logo on the charcoal grey galvanized dial.
THE DUOCHRONOGRAPH 756 DIAPAL