But from the quarz, i really dont know, i saw one in my life and what i know is, that they should be only a few, like two, three or maybe four, but i really dont know!
To Ben=> you must know, what you want! Is it important for you, that the back engravings are complete and complete right? You want a 3H or a small t or booth together? Or you prefer a Sinn refurbish, with no tritium signs? You can also become a Sinn refurbish with tritium signs, but without tritium!?
...
The early ones are the 3H and small t's, the later ones are without tritium signs and of course without tritium, because of the "Strahlenschutzverordnung der Bundeswehr"!

Good luck;)

FD