D.R.P. 1943 oddly refers to a helmet liner. More Google entries make me suggest DRP denotes date of production. Look at: Images for 220528. TUBKIKARE from the Third Reich. In case. - Auctionet The same logo appears on a material / leather case for a telescope.
D.R.P. on the box is rather meaningless, because the associated patent number is either missing or wrong: The patent numbers 19...... were assigned around 1877. Furthermore, patents refer to individual objects, but not to such a set or the box. https://www.optical-toys.com/files/Dokumente/AAA - Einzeldokumente/Patentnummern Deutschland.pdf