Murray,
Having looked at your holster and at the ones I have and the ones shown in Reinhart and Rutsch's books, I seriously doubt that this holster would be an ordinance holster. The fact that it is not marked should rule out any official use. In the absence of any marking, it could possibly be a Swiss commercial holster (see Rutsch p. 199, 2nd col.), though I've never seen one like yours before.
Hope this helped.
Panda
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