Portrait Heinrich Lahmann (Wikimedia Commons)

Photographic portrait of Heinrich Lahmann, credited on the Commons file page (fetched 2026-07-08 via the imageinfo API) to Alfred Brauchle, Naturheilkunde in Lebensbildern, Reclam, Leipzig 1937, the anthology of naturopathic-medicine pioneers in which it was reproduced; the original photographer is not named (listed as unknown author). Commons categorizes the file PD Old / CC-PD-Mark and its own license statement reads Public domain. Dimensions 1392x1888 read from the imageinfo API (not the search-hit thumbnail). Identification of the sitter as Lahmann rests on the Commons file's own title and description (Portrait Heinrich Lahmann); a vision-QA pass on 2026-07-08 confirmed the photograph shows a clear studio profile portrait of an elderly bearded man in formal attire, consistent with (though not independently verifying beyond) that identification.