Wittnauer made fantastic steel chronographs that are largely undervalued. This model has reached stratospheric heights due to its connection to NASA but we will see some readjustment sooner or later:
http://www.watchprosite.com/?page=wf.forumpost&fi=677&ti=1054643&pi=7607273&pzt=1456703651
"But truly we can share here that it was not a Daytona! Both they and Longines Wittnauer offered models powered by the Valjoux 72, but in both cases it wasn’t the models everybody in the Internet thinks."
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