I love homemade tools. Heres how I made this awesome little marking knife from a repurposed blade, from my jointer, and a scrap of Curly Maple.
Make a Handle for a Marking Knife's Blade, Part 2
Ohkubo - Blue Steel Marking Knife - 5/8
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POWERTEC 6-1/8 Inch Jointer Blades for Craftsman 21705 Jointer, Replacement for 922995 Jointer Knives, Set of 3 (148022)
The Perfect Marking Knife, at Last! - FineWoodworking
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How to make a DIY marking knife
Homemade Tools - Home Built Workshop