The latest shipment had only two pencils. One was this Colleen K-520. It has a triangular cross section with rounded edges.
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This is lovely! I managed to get a green one many moons ago. Colleen also made a square profile design, I think…
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Wow, never seen this one before!
That would be the DOHC—Dual OverHead Cam—“Hard Suspension,” characterized by a square body and firm knocking action. My samples are both extremely long; I think maybe only the clipless versions of the Ohto Grip500 are longer.
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How long are the Ohto Grip500?
Cool. The green Colleen pencils are the best. I have been looking for one of these for a longish time. It is pretty nice to finally find one. It has an all metal body, but the click is a little thin.
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Colleen also made a superlong pencil. It’s called long Gibson or similar.
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I’ve been looking for this bad boy for sometime now! Congratulations on your acquisition. It looks great!
Is there another pencil you could equate it’s weight to perhaps?
Love this and have it but sadly the clip is rusting on mine 
On the weight: it is heavier than a P207 but a little less than a Graphlet PG503. I will put it on the scale later.
Big Jibson
BTW, K-522 is also triangular IMG_0196 | JIB Colleens K-520 & K-522 | 2nd_astronaut | Flickr
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I need a few of these 
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As a matter of fact, Your post is exactly why I’ve been looking for the red.
Small world.
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