Parker 61 Instant Ink FOUNT-O-INK The Guilloché (engine turned) pattern

The Guilloché (engine turned) pattern on the surface consists of squares and lines

you can't use heat because the plunger is celluloid and it will bend (warp) easily with heat

mint condition

while the competition sometimes uses brass which tends to stretch more than stainless and has about a 20% higher thermal coefficient of expansion than stainless (i

Parker 61 Instant Ink FOUNT-O-INK The Guilloché (engine turned) patternThis was part of the revolutionary goodness inherent in the development of the 61; you didn't need to carry liquid ink around with you, but you COULD always have ink with you if you had water. Just put this capsule on the end of your filling unit, put it in water for 30 seconds, take it off, put your pen back together and you're all set to write like a scribe.