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Mystery Duofold Cap Size

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4 replies to this topic

#1 sanesan


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Posted 11 October 2018 - 19:58

Hi there, I bought this parker duofold cap recently, but the problem is it seems to be larger than a duofold junior cap but slightly smaller than a duofold senior cap. It won't thread onto a duofold jr. and is very tight against the 5 or so duofold senior barrels I've tried. If it helps, my duofold jr's cap diameter measures 11.8mm, while my duofold senior is about 13.4mm, and this mystery cap is 12.8mm. 




Left to right - duofold sr., mystery cap, duofold jr.



 Left to right - 3 duofold sr., mystery cap

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#2 Charles Rice

Charles Rice

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Posted 11 October 2018 - 20:13

OK, I'm on my second Martini, but isn't the cap on the right from a Senior Delux?  Sure looks like mine.


PS  -  if it is not cracked, I'd be interested in it.

Edited by Charles Rice, 11 October 2018 - 20:15.

#3 mitto


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Posted 12 October 2018 - 04:31

There was a in-between size Duofold called Special. It was longer than the junior and a couple mm shorter than the senior. I, however, am not sure whether the girth was any different from that of a Junior.

#4 joss



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Posted 12 October 2018 - 08:20

The cap band looks a bit odd. The (raised or flush) cap band on the Duofold Sr was about 3 mm wide. This one appears to be wider.

Also the location of the breather hole is different from the three Sr caps.

#5 mitto


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Posted 13 October 2018 - 04:54

I wonder if it is a Duofold cap at all.

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