Bluemels were certainly available, I think the ESGE (SKS) showed by 1975 or so. If you are looking for a bag support, Park Tool made a clipon in both Chrome with red or blue plastic coating and an alloy version. They came in 2 sizes one for short frames and the other for tall and just popped on. BOB FREITAS Hot in MILL VALLEY, CA USA
I recall even seeing Chrome WALD fenders on Paramounts and other Schwinns