Parker 51 Custom, Argentina, c. 1958, teal blue aerometric fountain pen, gold filled cap, medium gold nib, breather hole on the barrel end, cap free of dings, brassing and personalisations. Near mint, chalk mark on barrel indicating nib point size #2605 $USD 90
Parker 51 (prototype?) DJ fountain pen, Argentina, 1965. Gold filled cap, double black jewels, 14 Kt solid gold nib, fine point, aerometric filling.  Excellent to near mint in original box. #2533 $USD 120
Parker 51, USA, 1960, Classic de luxe, burgundy (scarce color), lustraloy cap, gold filled clip, engraved Parker, pearlescent jewel, gold nib, fine point, aerometric filling, excellent #470 USD 85
Parker 51 Classic, Argentina, c. 1960, grey aerometric fountain pen, frosted lustraloy cap, medium octanium nib, breather hole on the barrel end. Excellent #693 $USD 60.
Parker 51/ 61  Classic, Argentina, c. 1973,  transition 51 - 61 fountain pen and 61 mechanical pencil set, both instruments in Parker 61 dark gray.The fountain pen is Parker 51 model on the dark gray of Parker 61. Both instruments with matching  frosting stainless steel with polished ring caps, pearlescent jewels, only different in the length of the arrow clips. The fountain pen has a 14 Kt solid gold nib fine point, aerometric filling. The mechanical pencil is actuated by twisting the cap. Near mint in original rare box. Most probably the very last Parker 51 produced in Argentina, with the one piece metal cover of the ink reservoir and the same Lucite gray color used for Parker 61 model. Extremely scarce #478 $USD 150