Photos of the clock during the restoration process and afterwards: (Continued from Philipp Hauck (PH) 400-day Clock from York National PART 1) Note: this is posted in 2 parts due to image limitations of the board; if you've not read part 1 yet, please read it here) Although the spring had quite a bit of surface rust, an overnight soaking in penetrating oil took most of it off. After a thorough cleaning in acetone, 600-grit sandpaper was used to remove the rough spots. There was some pitting, but not enough, in my opinion, to require that the mainspring be replaced. Here’s the mainspring after cleaning and sanding, before oiling: The only resurfacing done was to the rusty steel base plate. It was sanded down, treated with two coats of Rust Buster, sanded again, then painted with flat black enamel: Everything else first went through the ultrasonic, then all pinions were cleaned by hand with pegwood, the pivots polished (very little of that needed). The plates were polished and the pivot holes pegged. Surprisingly, the weights and weight spindle, which at first appeared to be rusted together, came apart easily with a little penetrating oil. The spindle and the rest of the pendulum cleaned up very nicely;: And here’s the assembled, restored clock: As shown earlier, the spring guard was originally installed facing upwards. This, however, did little to protect the spring and made it impossible to set the beat, as the guard is held in place by the same screws that support the saddle. Inverting it simply made sense. Also, an interesting feature about this clock is the spring retention clip: A micrometer reading to show plate thickness: The final clock with the nice, thick globe John generously provided: The clock has been running very steady for over 48 hours and has only lost a minute, so only timing is no needed. The pendulum in energetic with ~300 degrees of rotation. This one’s a keeper! Addendum: John Hubby provided some interesting information about the Philipp Hauck (PH) clocks and the Terwilliger guide. I’ve posted it below for reference: All the clock back plates in the Repair Guide that are shown as made by Phillipp Haas (PHS), were in fact made by Philipp Hauck (PH). Very evidently Charles Terwilliger in identifying these clocks mistook the letters "PH" in the logo stamp on Plate 1519/1519A to represent Phillipp Haas. Our research beginning in 1995 uncovered the error rather quickly, and about a year later we were able to contact a descendent of the Haas family who had worked in their factories in the 1920s who categorically stated that Haas had never made torsion pendulum (400-Day) clocks. Further research revealed that a number of back plates that had been identified by Terwilliger as made by Jahresuhren-Fabrik or as Manufacturer Unknown were also Hauck clocks.