OK good news for all who followed this question. Jason is right. I dag into the negatives box and ...the plate I took did not correspond to that carriage. So here I go again, hopefully with all mysteries solved.
All Photos Balkanmodels: Carriage Βφπτ 562 is by Dusseldorfer 1902. Note that there are only three remaining buffers in all photos, and note the last inspection date!
Photo Balkanmodels: April 1990. Carriage Βφπτ 562 again near SOM Thessaloniki.
Photo Balkanmodels: Carriage Βρτ 599 is by De Dietrich works number 50187 of 1913.
Photo Balkanmodels: The works plate of carriage Βρτ 599.
...and finally for today
Photo Balkanmodels: An ex JSC carriage by Franco-Belge Paris 1895.
Photo Balkanmodels: April 1990. Two ancient wagons with preservation numbers painted on, near SOM Thessaloniki. Slightly off topic but at the right end of the photo the brake hut of the JSC carriage.
christo.