I think the M16's point in that direction too..........
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There were no military markings on the issue swifts, other than (occasionally) stick on labels, same goes for the very 'civilian' case they were issued in...
Someone has resurrected an old post 'BritishArmy Spotting Scopes' that shows mine fresh from MOD disposal.
Only IDs were small square labels on the tripod and NSN numbers on the case