So, the third of my Lange family. A straightforward, three-hand movement with sub-seconds. Simple? Yes. Boring? No. Together with the L121.1, one of Lange's clearer three-quarter plate executions - no impediments. The Glashütte ribbing is well-defined and...
I think yours is polished vs. brushed only because it is rose gold, not so much because of the manufacturing date (though Lange did start brushing more rose gold cases after 2015). Unless I'm mistaken (which is quite possible), this surface is still polis...
It is because it's PG but also because of evolution in technique over time: the current 1815 Chronograph and Annual Calendar feature brushed case-backs in PG whereas, as you say, the straight 1815 and Up/Down still do not. Wow, you've made a great point w...
It's funny you mentioned Glashutte ribbing and graining, because just yesterday I was trying to take a macro shot of that. Here's an imperfect attempt ... ...