Spaz,
According to my 1/11/35 reference of SA "Brigaden-Gruppen-Standarten", Pommern Brigades were 7, 8, 9, 107, 108, Marine Brigade 1. There is no Brigade 10 listed; 11 and 12 were assigned to Gr Hansa. So, I speculate that, perhaps, an SA Motor Brigade 10 might have been created for Pommern. Then, when the NSKK came along, the scabbard was changed to black.
Only a guess! I have been unable to locate a later SA "Standort-Berzeichnus" than the 1935 copy. EBJ