A. Lange & Sohne released a 38.5mm, 1815. This watch has a 55 hour power reserve and has a smaller case size than previous 1815 models.
The 1815 model is still being produced in 40mm as well as 38.5mm (the latest model).
http://www.hodinkee.com/blog/hands-on-with-the-new-2014-a-lange-sohne-1815