A friend of mine sent this link to me as he knows that I've been an avid ECM collector for quite a few years. I endeavored to collect on vinyl the label's entire output until ECM went to CD-only. I've been adding some ECMs to my collection recently and I've just entered in my database Krakatu -- Volition ECM 1466. This is the highest # I've seen on vinyl.
As for the never-released-on-cd-ECMs: I'm not sure about the following -- someone please correct me if I'm wrong:
1141 George Adams - Sound Suggestions
1164 Abercrombie Quartet
1191 Abercrombie Quartet M
1187 Rainer Bruninghaus Freigeweht
1901 Larry Karush/ Glen Moore May 24, 1976
1357 Hans Koch/ Martin Schutz/Marco Kappeli Acceleration
1081 Art Lande Rubisa Patrol
1106 Art Lande Rubisa Patrol Desert Marauders
1214 James Newton Axum
1071 Tomasz Stanko Balladyna
1160 Steve Swallow Home
1113 Tom van der Geld and Children at Play Patience
1224 Enrico Rava Opening Night
19003 Percussion Profiles
19004 Manfred Schoof Quintet - Scales
ECM/SP 2305 801 Peter Ruhmkorf - Kein Apolloprogramm fur lyrik