Price wise, I think that the following values come pretty close:
29/70 and 06/73:
-Unboxed or boxed but used, incomplete or worn < 700.
-Unboxed, incomplete set in good condition 800 - 900.
-Boxed, complete in good or unfired condition, no provenance. 900 - 1200.
Add about 100 for a Transitional (1972) and non-regular barrel lenghts (4" .30 luger, 5").
29/70, 06/73, Transitional (1972)
-Boxed, complete, mint condition, with provenance (documentation available) 1500-ish.
Specials
-Special versions, rare finish, early prototypes, one-offs, etc... 2000+ depending on condition, rarity, completeness, provenance etc...
Provenance: means that the pistol serial number is recorded and available in period documentation.
Incomplete: A normal set includes the box, pistol, test target, warranty card, manual, loading tool, 2 magazines (Mauser marked!), cleaning brush, medallion with pistol number. Any part that is missing, is not numbered to the gun or has been replaced (magazines by KKK magazines, for example) lowers the value. The paper box, test target and medallion are numbered to the gun!
Hope this helps. Comments appreciated (nice comments, that is
).
Since pistol 1928 is incomplete, but has provenance, it would fall into the 800 - 900 range, perhaps a little more.