Overall:  Vintage Parker Duofold Lucky Curve with new sac and fully functioning.  Some signs of age and wear described below.  
Body:  Smooth luster.  No gouges or teeth marks.  No cracks.  Cap threads are in good condition.   Blindcap in good condition with no discoloration or gouges.  Blindcap threads have a very slight chip that does not effect threading of the blindcap (see picture).  Slight surface scratches present on body.  Factory imprint reads "GEO S. PARKER JANESVILLE WIS  DUOFOLD JR LUCKY CURVE  FOUNTAIN PEN U.S.A. PAT. 4-25-11"  Imprint is still visible but light.  The jade celluloid has discolored to an olive color. 
Section: Smooth luster.  No gouges or cracks.  Slight olive decolorization.  
Nib and feed:  Great flow.  Nice 14 K nib with mild flex.  Lovely writer.  Has slight feedback.  
Cap:  Beautiful luster, No chips, cracks, gouges, or teeth marks.  Only slight discoloration with time.  Gold trim on cap ring is mostly (80-90%) worn.  The clip gold trim  is still present but worn at the top and at the ball.  Cap will post nicely on pen.  Clip has good strength.
Writing condition:  Button filling mechanism works perfectly with a new sac and talc.
Dimensions: Capped:  118 mm.
Uncapped:  107 mm.
Posted:  146 mm.
Body width:  12 mm
Section width: 10 - 9 mm.