Although German, Heinrich Ortgies lived in Liege for several years. There he designed an automatic pistol, patented in 1918. He returned to Erfurt after hostilities had ceased, to begin making the 7.65mm Ortgies pistol. Success was considerable, even in the depressed powtwar market, Upwards of 10,000 were made. However, DeutscheWerke (q.v.) of Erfurt made the inventor an offer too attractive to refuse, taking over the patents, stock and tools. ortgies himselfappears to have taken no further interest in firearms..
The original Orgtgies-made models are marked ORTGIES & CO. ERFURT ORTGIES PATENT on the slide, a bronze medalion with an 'HO' monogram being let into the grips. These medallions were retained by Deutsche Werke for some years, together with the Ortgies Patent. Both these acknowledgements were subsequently dropped, marking the the expiring of Ortgies interest in his patents.
Looking at the medallion on the photo suggests to me that the gun was produced after Ortgies resigned all interests in firearms or is not the original grip but is an after-market. Ther is also the possibility that this is the grip made with the pistol after the resigning.
HJN