I would argue a legit bcd mount with a phosphate ajack in this serial range would answer the question.
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I looked at my LSR list and do not have any Sauer LSR`s with Phosphate Ajack Scope . I do show Sauer LSR`s with Blued Ajack Scopes and also Gustloff with both Blued & Phosphate Ajack Scopes . IMO it is not an impossibility that Sauer may have used/received some Phosphate Ajack Scopes but I have not recorded one Yet . Never say Never .
Lets remember the SSR Sauer discussion about what scope types were supposedly only used and period photos proved other wise .