C4: The Cartridge and Convertor Compatibility Chart

Cross-references which cartridges and converters fit which pen brands, as stocked by four mail-order suppliers: Fountain Pen Hospital, Fahrney's, and Colorado Pen Co. (plus each supplier's own small in-house catalog). Bracketed figures are pack size and price at the time this chart was compiled. NL means that supplier doesn't list a match for that brand.

Brand Fountain Pen Hosp. Small Catalog Fahrney's Converter – Fahrneys Colorado Pen Co Converter – CPC Small Cat. Convert
AncoraNLStandard [6/pk 2.95]NLNLNLNLNL
AuroraAurora [4.30]Aurora [4.30]#30111 [5/pk 3.10]#56815 [5.50]A20-00879 [5/pk 2.75]26-08188 [5.00]NL
Burby'sNLStandard [6/pk 2.95]NLNLNLNLNL
Bossert & ErhardStandard [6/pk 2.95]Standard [6/pk 2.95]NLNLA20-11355 [8/pk 4.00]26-11357 [3.50]NL
Caran d'AcheStandard [6/pk 2.95]C d'Ache [5/pk 2.00]#3C [10/pk 6.00]#251300 [4.75]NLNLNL
NLNL#TP6 [6/pk 2.35]NLNLNLNL
CartierNLVendome [10/pk 13.00]25110 [10/pk 13.00]#800021 [12.00]A20-11355 [8/pk 4.00]NLNL
NLOthers [10/pk 10.75]#54000 [10/pk 3.75]Pasha #/00019 [55.00]NLNLNL
ColibriNLStandard [6/pk 2.95]#3C [10/pk 6.00]NLA20-13106 [6/pk 2.95]NLNL
CrossCross [6/pk 3.00]Cross [6/pk 3.00]#9892C [6/pk 3.00]#8930 [4.00]A20-14409 [6/pk 3.00]26-14412 [4.00]Converter [4.00]
Dani TrioStandard [6/pk 2.95]Standard [6/pk 2.95]NLNLNLNLNL
DeltaStandard [6/pk 2.95]Standard [6/pk 2.95]#30111 [5/pk 3.10]#56185 [5.50]A20-1135526-11357 [3.50]NL
DunhillNLNLNLNLA20-14068 [12/pk 4.95]26-14070 [32.50]NL
DupontDUPONT [3.50]Orpheo & Fidelio [3.50]Orpheo 40110 [6/pk 3.50]O & F #251300 [4.75]A20-08627 [6/pk 3.50]26-14055 [13.00]NL
NLOthers [3.50]Fidelio #TP6 [6/pk 2.35]NLNLNLNL
NLNLMtP, II, Plu 40100 [6/pk 3.50]NLNLNLNL
Faber-CastellStandard [6/pk 2.95]Standard [6/pk 2.95]#TP6 [6/pk 2.35]NLA20-09152 [6/pk 2.95]NLNL
InoxcromNLNLNLNLA20-113355 [8/pk 4.00]26-11357 [3.50]NL
HysekNLNLNLNLA20-09469NLNL
LepineStandard [6/pk 2.95]NLNLNLNLNLNL
LamyLamy [2.45]Lamy [2.45]#T10C [5/pk 2.45]Sfri *Z20 or CP1 [5.00]A20-00704 [5/pk 2.45]Sfri 26-00757 [4.50]Sfri Z24 [4.50]
NLNLNLPersn #Z23 [6.00]NLAcc't 26-00579 [4.50]Acc't Z25 [4.50]
NLNLNLNLNLNLOth Z22 [5.00]
MarlenStandard [6/pk 2.95]Standard [6/pk 2.95]NLNLNLNLNL
M.PerchinStandard [6/pk 2.95]Standard [6/pk 2.95]NLNLNLNLNL
Mont BlancMB [4.50]MB [6.00]#4C [6/pk 5.00]#03CN [9.25]A20-095080 [6/pk 6.00]26-07744 [9.25]Converter [9.25]
NLNL#TP6 [6/pk 2.35]NLNLNLNL
MontegrappaStandard [6/pk 2.29]NL#TP6 [6/pk 2.35]#AC3 [13.50]NLNLNL
MT.VerdeNLStandard [6/pk 2.95]NLNLNLNLNL
PilotNamiki [2.10]Namiki [12/pk 4.00]#1C-100 [12/pk 4.00]PICOVN [9.00]A20-18981 [12/4.00]26-03418 [3.50]NL
NLNamiki [6/pk 2.10]NLNLNLNLNL
OmasOMAS [4.95]NLNLNLNLNLNL
ParkerQuink [2.95]Parker [3.10]#30111 [5/pk 3.10]Duo #56185 [5.50]A20-0828726-08188Twist [5.50]
Penman [5.75]NLNLSlide #56183 [5.50]NLNLSlide [2.95]
PelikanStandard [6/pk 2.95]Standard [6/pk 2.95]#TP6 [6/pk 2.35]NLLong- A20-14044 [7.95]NLNL
Retro 51Standard [6/pk 2.95]Standard [6/pk 2.95]#TP6 [6/2.35]#56010 [5.00]NLNLNL
RotringStandard [6/pk 2.95]Standard [6/pk 2.95]#TP6 [6/pk 2.35]#251300 [4.75]A20-18075 [6/pk 3.00]26-00083 [4.75]Rotring [4.75]
SheafferSheaffer [1.95]Sheaffer [1.95]#96300 [5/pk 1.95]#86700 [5.75]A20-15490 [5/pk 1.95]26-01407 [4.00]NL
StipulaStandard [6/pk 2.95]Standard [6/pk 2.95]#TP6 [6/pk 2.35]NLNLNLNL
TombowStandard [6/pk 2.95]Standard [6/pk 2.95]#TP6 [6/pk 2.35]NLNLNLNL
ViscontiStandard [6/pk 2.95]Standard [6/pk 2.95]NLNLNLNLink pellets 7.50
WLDMNNNLStandard [6/pk 2.95]NLNLNLNLNL
WaterfordStandard [6/pk 2.95]Standard [6/pk 2.95]NLNLA20-07609 [6/pk 4.00]26-11361 [5.00]NL
WatermanWaterman [3.95]Waterman [4.00]#052027C [8/pk 4.00]#50610 [5.00]A20-11355 [8/pk 4.00]26-11351 [5.00]Standard [2.95]
NLNLLady #052126C [6/pk 1.70]#89508 [10.00]NLNLNL
Yard-O-LedNLStandard [6/pk 2.95]#TC6 [6/pk 2.35]NLNLNLNL
NLNL#3C [10/pk 6.00]NLNLNLNL

Note: some brands have more than one row — where the Brand column is blank, that row lists an additional cartridge/converter option for the brand named directly above it.