I had some Stainless 1911 6-Round Officers Length Frame Magazines given.to me. 1. Stainless uncoated Devel-Style follower with one dimple on rear. 2. 5 staggered holes per side. 3 Front - 2 Rear. 3. Marked "45 ACP" on left side of magazine near the bottom. Slightly closer to rear than front. Half letter spacing between numbers and between letters. 4. 2 Vent Holes in welded stainless baseplate. 5.1 half circle vent hole in front of tube directly over baseplate. 6. Baseplate appears to a pressfit from from of tube with no lip or groove. Flush with tube rear and side walls 7. No visible spot welds. 8. Very small "s" (smaller than vent hole) on baseplate exterior centered between the rear baseplate vent hole and the rear tube wall. Left side of S toward front of magazine Anyone identify the manufacturer of these magazines?