Jack
1000 machines in 20 years. I don't believe that the Sikorsky S-76 has reached this number after almost 44 years of production.
S-76 didn't go past around 800 ish. The 139 of course started as the Augusta Bell 139 and straddled both the 412 and S-76 segments with the space of the 412 and the speed of the S-76 cleverly creating its own niche. Its also a great helicopter and has become the default medium choice. I wonder if the 525 will one day become a game changer?