First, look at the hour markers. Though applied and thoroughly modern, they really, really resemble the painted tritium markers of the 1970s. They are double-beveled as well. They are entirely different than those found on the "Home Plate" Heritage Chronos. Here is the brand new Tudor Heritage Chrono blue next to a reference 7149, which is not exactly the watch on which this was based in that it has a tachy bezel instead of a rotating bezel, but close enough to get the idea of how closely Tudor paid attention to its history.