Rose Gold and a Blue dial make the 220.037 the warmer of the two 34 mm 1815 references A. Lange & Söhne introduced in 2025, a size that answered requests for a smaller, quieter dress watch from Glashütte. Its blue dial recalls one of the earliest modern 1815 variants of the late 1990s, and the watch carries Lange's 75th manufacture movement, designed for the smaller case. It sits in the regular 1815 collection rather than a limited run.

The Rose Gold case measures 34 mm across and 6.4 mm high, finished with a brushed case band and a stepped bezel. The Blue dial of solid silver keeps the 1815 vocabulary, a railway-track minute scale around Arabic numerals, with Rose Gold lancet hands and a recessed small seconds at 6 o'clock. It is fitted to a reddish-brown alligator strap with a Rose Gold prong buckle, and the movement shows through a sapphire caseback.