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I think you mean HR/5, correct? It should also say "Fully Muli-Coated" on the left cover plate? The first two digits of the s/n indicate that the manufacturer made it in the year 2000. So the previous owner may have been off by a year on the date of sale; or possibly your binoculars were in the last batch sent to Swift for sale in late 1999. In any event, the 804 Audubon was not included in Swift's 2000 catalog; rather, that was the year the new Model 820 Audubon was introduced. The exact details about your specimen may just have to remain an interesting mystery.