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Old 26th November 2015, 07:52 PM
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rich rich is offline
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Join Date: Nov 2008
Location: Shebbear, N Devon
Posts: 1,643

Looks rather like it.

If the S stands for anything literal it's probably something in German. The nature of the "engraving" suggests it's meant to be permanent but not widely on display, so perhaps it would be meaningful to a future service engineer.
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