Parker Deluxe Challenger, USA, c. 1935, ball clip, three cap rings, big red rage chunks & black marble, button filler, original Parker 27 nib,14 KT Gold, fine point. Light marks of use, good clean imprint and bright colour, a lively pen, excellent. #629 $USD140
Parker vacumatic major, USA,1945, silver pearl laminated celluloid, red transparency, CPT, blue diamond clip, on the barrel imprint "Geo Parker Parker Vacumatic Made in USA 5, 129 mm capped, pump filler, plastic plunger, gold Parker arrow Medium point nib. Excellent. #2598 $USD 150

For illustration: picture of different English Parker Duofold model sizes, from left to right:

Green Arrow, black Maxima, black  Senior, black AF double jewel, chocolate AF,  green demi Duofold, green Junior Duofold, blue Slimfold, Vacumatic Major (USA).

 

Parker Victory, Denmark, late 50s, imperial blue, gold filled clip and band, on barrel crisp imprint Parker Victory Reg. T.M. M. I. D. (Made in Denmark), 14kt solid gold nib, médium point, imprint PARKER 14k D (for Denmark), arrow shape clip, aerometric filler. Length capped 13,5 cm, posted 15,7 cm, diameter 13 mm. Distributed by danish Parker and Penol manufacturer Chr. Olsen. Very crisp imprint, free of any brassing, near mint, scarce Denmark production #2188 $USD 105
Parker 17, c. 1964, England, forest green, gold filled clip and thin cap band, aerometric filling, original solid gold nib, fine point. Senior size length capped 5 3/8, posted 5 5/8”, diameter ½”.  Some plating loss, very good  to excellent  #2334 $USD 60
Parker 17, c. 1964, England, Imperial blue, gold filled clip and wide cap band, aerometric filling, original solid gold nib, generous iridium medium point. Senior size length capped 5 5/16, posted 5 6/8”, diameter ½”.  Excellent. # 1487 $USD 60
Parker Duofold NS, c. 1953, England, solid green celluloid, gold filled clip and broad cap band with chevron pattern, aerometric filler, medium fine point original nib imprint  "Parker 14 Kt 585 England 35" Length capped 5", posted 5 7/8", diameter 1/2". Minimal plating wear on the edges, excellent. # 1298 $USD 135
Parker Junior, England, c.1962, red, gold filled clip and chevron cap band, aerometric filling, original nib imprint "Parker 14 K England 10”, medium semiflexible point, nice line width variation. Size capped 5 ¼ “, posted 6 3/8”. Excellent.#2186 $USD 95