Doesnt look so large as for S98/05, possible for S84/98 in natural color. With steel rivets post 1941 production, there are some makers they didnt colored the leather.
Was looking at the second photo and clicked on it to enlarge the picture. To right of the "E" and just above the bottom three stitch lines, it almost appears there is a line of letters S W U _ _ ? Anyone else see something like this...?
I personally would tend that on that position is a pattern of sewing mashine, i would look at backside of belt area as there could be woried off a RBNr stamp. Is there secure strap cut off?
I see a small W ink stamped or perhaps written at the bottom underside of the pouch. Have seen this several times with H, M or W stamped in this area on otherwise unmarked frogs. I do not know what the markings signify.