Judging from other items this seller has on E-bay I'm inclined to think it's genuine. He's selling items belonging to his late father who played Sax. The box with the Tone Edge reads 'Pompano Beach Florida' but the piece is not a 'slant sig'. Other items include a Lawton 6* and a Florida 5* STM and a Berg 85 alto piece.
This type of kit is typical for guys who played in dance bands in UK during the Post War years up to recent times. They looked after their gear and kept boxes!
I know more about metal Links, but this HR piece looks indeed like an Early Babbitt (first Babbitt Tone Edge types, but still made as in the Otto Link Florida period and shipped in the old boxes). For the metal STM links this Early Babbitt period ranges from about 1974 to 1980. I don't know for sure if it's the same for the HR types, but I guess it is.
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