Used OEM Mopar distributor.  2444259 31 5 with big '42' stamped next to the main part number.  Rotor button shows 3874 401.  See pictures.  

Ran in multiple motors including 318 wide block. Condition is "Used".  

Would probably work as it is, but great jump start for a rebuild core.

Vacuum advance works smoothly, and diaphragm seems to hold pressure (vacuum).

Been on the shelf for several years in clean dry storage.