I'd love to see that original Tourbillon PLM in YG have its crystals replaced with AR-coated ones, as an inexpensive means to bring out its full beauty! But I suppose they want to keep it truly original, so they're leaving it alone with non-AR crystals. This also got me curious about Gunter Blumlein's involvement with the Lange 1 Tourbillon, which was introduced shortly before he passed away. I do not recall the extent of his involvement with that watch.