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9476: Parker 51 set in box: cordovan Vac-filler with frosty two-tone Lustraloy cap, gold filled Blue Diamond clip, with matching .9 mm pencil; set appears unused, pen has 2nd quarter "T7" date code, both pieces with matching inscriptions, "U. SUZUMURA", pen also "FUZAI JINUSHI KYOGIKAI" (Absentee Landlords Association).
DATE:
1947 • CONDITION: mint • NIB: fine • $260 
9709: Parker 51: early production Teal Blue Aerometric filler with factory transparent hood; Lustraloy cap, chrome plated trim, sac is a new old stock replacement; barrel imprint bears 4th quarter 1948 date code, connector is Lucite, not vinyl as on later pens.
DATE: 1948 • CONDITION: fine-exc • NIB: fine • $225
9604: Parker 51: not a Parker product at all, but rather an early Japanese counterfeit: cheaply made, yet with extraordinary attention to detail. Thinly-plated cap is fully falsely marked, as is the barrel and filler housing. Even the flimsy plated nib is marked! A very interesting specimen for the 51 collector.
DATE: c. 1950
• CONDITION: VG* • NIB: medium fine • $150
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
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