Hi,
Dwight was absolutely right on the 2/1001 mark. The East-Germans adopted a 4-digit 'lieferantnummer' or 'deliverers code' and the Haenel company was known as 1001. Haenel also got the Walther production lines (that ended up on the Eastern-German side) and produced a Walther PP/PPK version for the East-Germans known as the 'Pistole 1001'.
These 2/1001 magazines are identical to the pre-war Haenels, with the exception of the base. This was later made from the casting material also used for small toy cars 'grauguss'. (uncertain about the correct English term for this material

).
East-German lugers were sold in the 60s, 70s and 80s by the East-German government and they ended up everywhere. Some have surfaced in Europe, others in the Middle-East and others in the USA. Just about everybody bought and traded them. Many were dismantled for parts.