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I've been admiring that sleeveboard pen of yours ever since I started reading this forum. Now that I see it next to the Case yeller pen (my favorite of my pen knives) I think it might actually be too skinny.
It is quite thin, but that makes it ideal for carry in suit pants that are too tight fitting for most other pocket knives.
One thing I really like about the new bone handles on the Schrade 708Y (second down from the top), is how they widened the knife from its original format factor, which actually makes it more useful.
Edited to say, I'm right there with you on the Case pen. It is easily my favorite of the four.