That what i guess...first the Musterplatte, then Promo, then normal Release for sell.Even if i have not heard often about "Musterplatten", cause i don't see the sense in it at all. Is it just to check how the songs will sound on Vinyl? If so, there couldent be much around. Normaly 1 or 2 must be enough.Because the job of promotion and checking for feedback should be done by the Promotioncopies.
Noticed that there are 3 different releases (well to be specific, 3 different labels) of the DE2007 record (4 if you count the Forbidden Planet release too). Was/is this standard? First you press the Musterplatte (sample vinyl) than the promo and finally the original? "Musterplatte""Promo (?)""Original"