For those who didn't do the effort to read the article:
1969 Alaska I = 4 made in Ttianium case ( 3 went to NASA Houston )
1972 Alaska II = about 15 made ( some with Tachymètre bezel, others with 60-minutes bezel )
1978 Alaska III = 56 Radial dial Speedmaster chronographs for NASA
2008 = 1970 commemorative pieces
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