The title of this episode is Kintsugi, Japanese for 'golden joinery'. It is the art of repairing a piece of broken pottery using a lacquer mixed with powdered gold (sometimes silver or platinum are used instead). This highlights the damage, rather than disguising or obscuring it.
Philosophically, it recognises that damage and repair are both part of the history of a thing, something to be seen or recognised rather than disguised.
Nicole is driving her 1954 Kaiser Darrin again, with doors which slide forward into the front fenders. Joe is seen sliding the passenger door when he gets into the car with her.
The sabre that Joe takes down and looks at is a Pattern 1796 Light Cavalry Sabre/1811 "Blucher". Originally adopted by the British Army, it was later copied by the Prussians and was still carried into battle as late as World War I. The plaque on the display refers to the Franco-Prussian War of 1870-1871. The rank of F Heusmann, is Oberst, but the sabre does not look as though it is finished as an officers' version of the weapon- particularly not for a colonel. British officers' swords were privately purchased and while only subtly different in design, were often embellished with gilt, blued and decorated blades, and custom grips- which we unfortunately cannot see in this sequence.