Indeed, it is a two tone jubilee that GMT masters and DateJusts etc used to sit on. Can be 62523.H14 (14K gold; earlier 4-digit models, before 1980) or 62523.H18 (18K gold, after 1980).
That being said, these older clasps also has a date code with 1-2 letters (designating the year) and 1-2 numbers (designating the month).
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