Hi again, Swenson's table shows two high S&s forks - the 457.2hz (NY) and a 454.7hz (London), and now I recall a '70s grand with a strange treble scale (a "C-minus", albeit too early in my experience for any better detail). Short of wire testing and specific factory documentation (as presented, I don't think the two forks qualify this), comparing Bill's with other scales should permit a reasonable guess. Clark
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