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9284: Parker 51 set in box: black double-jewel with scarce and desirable Heritage "windowpane" 1/10 16K gold filled cap, 14K solid gold trim, bold imprint with 2nd quarter date code, two-tone clutch ring, with matching .9 mm pencil.
DATE: 1946 • CONDITION: fine-exc • NIB: extra-fine • $800 
9253: Parker 51 set in box: Nassau Green double-jewel with 1/8 14K gold filled converging lines pattern cap, matching .9 mm pencil. Caps crisp, overall condition like new, noting name on pencil barrel, staining to box interior. Pen has two-tone clutch ring, bold imprint with 2nd quarter date code; the set is a correct and unusual late-production example, with plain clips without the Blue Diamond.
DATE: 1947 •
CONDITION: near mint • NIB: extra-fine • $950
9367: Parker 51 Demi: late production black vest-pocket Vac-filler, 12.3 cm long, Lustraloy cap, chrome plated trim, barrel imprint worn but legible with 4th quarter date code; celluloid filler plunger bent, but does not affect function; smooth writer, Vac-filling Demis are both shorter and significantly less common than the later Aerometric Demis.
DATE: 1948 • CONDITION: fine • NIB: fine • $145
8859: Parker 51 set: black Aerometric filler, Lustraloy cap, matching .9 mm pencil; pen more worn than pencil, though excellent sac transparency; pen has imprint with 1951 date code, pencil bears 1952 date code, both marked with same initials.
DATE: 1951/1952 • CONDITION: fine-exc • NIB: fine • $165
9297: Parker 51 Presidential: 9K solid gold English-made Aerometric filler, wavy lines pattern, London hallmarks; new old stock sac, breather tube appears to be solid gold rather than the usual sterling silver; minimal wear, some bumps to barrel indicia, barrel seam professionally rewelded (see detail).
DATE: 1954 •
CONDITION: fine* • NIB: medium • $1200
9381: Parker 51 Demi set in box: Forest Green Aerometric filler, frosty Lustraloy cap, excellent sac transparency, filler housing references Superchrome ink; with matching Liquid Lead pencil, refills no longer available.
DATE:
c. 1955 • CONDITION: near mint • NIB: extra-fine • $265
5828: Parker 51 pencil lead refills: 12 leads in a stoppered glass tube, 8 cm long, made in England, label reads "for Parker '51'/ROTARY PENCIL", with Parker "halo" mark; many available, all "B" hardness.
DATE:
c. 1964 • CONDITION: mint • $6