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Four is the most that fit side by side. Drop one to add another.

P138 Majohn × P140 Majohn × P136 Majohn × P139 Majohn ×
Score 6.9medium confidence 8.1high confidence 7.7high confidence 7.7high confidence
Reviews read by hand 7.0 8.7 8.0 8.0
Reddit sentiment 6.7 7.3 7.3 7.2
Typical price $50 $57 $40 $65
Price range $49–$68 $48–$65 $34–$184 $44–$85
Collectors who log it — 55 89 35
Mentions found 28 1339 1009 449
Filling Piston Piston Piston Piston
Nib — #8 nib #6 nib #8 nib
Nib widths Extra Fine · Fine Fine · Medium Broad · Calligraphy · Extra Fine · Fine · Medium · Stub Calligraphy · Fine · Flex · Medium
Length capped 135 mm — 146 mm —
Diameter 13 mm — 14.8 mm —
Weight 35 g — 26 g 34 g
Materials resin · metal brass · ebonite / hard rubber · acrylic · resin titanium · stainless steel · acrylic · resin brass · ebonite / hard rubber · acrylic · resin
Homage to — Montblanc Meisterstück 149 Montblanc Meisterstück 146 Montblanc 139
Colourways 3
 9
 22
 8
Stocked at 4 3 4 6
For
  • Piston fill in a pocketable length
  • Solid metal trim
  • Ebonite feed — rare below several hundred dollars — and credited with the flow and lack of hard starts
  • Huge piston capacity, months on a fill
  • Excellent out-of-box writing reported
  • Nibs interchange with the Asvine V800
  • The ink-window band is a genuinely original piece of design
  • Large piston capacity
  • 146mm / ~26g — comfortable full-size proportions
  • Titanium editions available with Bock 18k nib option
  • #8 nib at well under $100
  • Brass piston mechanism, large capacity
  • Ebonite feed on some versions
Against
  • Heavy for its length
  • Little independent coverage
  • Clip is very stiff to lift
  • Grip flange slightly sharp
  • Too long and heavy posted for most hands
  • Piston disassembly needs a dedicated wrench
  • No branding on the cap at all
  • House nib is the usual lottery
  • Resin versions feel their price next to the titanium ones
  • Big and heavy enough to divide opinion
  • Nib QC lottery applies
◂ better of these faded — all the same Clear all

Dimensions are mined from retailer listings — approximate. A dash means no source gave it, not that it is missing.