The original LP issues

address:
2 Hamburg 61, Quedlinburgerweg 4 [no label code] - 1976 - Sky 001, 002, 003, 006
Quedlinburgerweg 4, 2 Hamburg 61 [no label code] - 1976 - Sky 004, 005
Quedlinburger Weg 4, 2 Hamburg 61 [no label code] - 1977 - Sky 007, 008, 009
Quedlinburger Weg 4, 2 Hamburg 61 [LC 4435] - 1977-78 - Sky 010, 011, 012, 013, 014
Quedlinburger Weg 4, 2000 Hamburg 61 [LC 4435] - 1978 - Sky 015, 016
Nordhauser Weg 16, 2000 Hamburg 61 - Sky 017 +

distributed by: 1978+
Im Vertrieb der Deutschen Austrophon, 284 Diepholz - Sky 013+ except...
Im Vertrieb der Deutschen Austrophon, 2840 Diepholz - Sky 017, 023, 032

later Deutschen Austrophon became Deutsche Austrophon, aka DA Music
Sky 024+ will add more info if needed

The original batch of Sky CDs
All issued in 1986
distributed by Discobox GmbH

Sonopress ref [Sky cat.no.] Artist - Title...
B-5871 [sky-CD 32/103-104] Various ‎– Schwingungen - New Age Music
B-5872 [Sky CD 3095] Eno, Moebius, Roedelius, Plank - Begegnungen II
B-5873 [Sky CD 3090] Eno, Moebius, Roedelius, Plank - Begegnungen
B-5874 [Sky CD 3091] Moebius & Beerbohm - Double Cut
B-5875 [Sky CD 3085] Moebius, Plank, Neumeier - Zero Set
B-5876 [Sky CD 3064] Roedelius - Wenn Der Südwind Weht
B-5877 [Sky CD 3058] Roedelius- Lustwandel
B-5878 [Sky CD 3005] Cluster - Sowiesoso

Sky started up in 1975, but it took them until sometime during 1976 to issue their first release.
Sky were still trading in 2010, although the last new release was 2001.