FB41 Darn Dao

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The FB41 Darn Dao is Spyderco's second Flash Batch knife and is based on the Bob Lum custom of the same name.

Appearance in catalogs

The FB41 Darn Dao appeared in the following Spyderco product catalogs:


Bob Lum

History, mentionings etc. from the forums

Information from the Spyderco catalog on the web

FB41 Darn Dao

The late Bob Lum was an incredibly skilled knifemaker with a remarkable talent for translating traditional Asian tools and weapons into modern form. One of his rarest custom designs, the Darn Dao, was inspired by the legendary “single knife” broadsword of the classical Chinese martial arts. After literally years in the making, Spyderco is extremely proud to translate that breathtaking design into a factory-made form.

The Spyderco Darn Dao faithfully translates every detail of Bob Lum’s meticulously crafted custom design into an equally dynamic production knife. Its satin-finished blade is full-flat ground from thick CPM® 154 stainless steel—a state-of-the-art powder metallurgy stainless steel that offers increased toughness over the conventional ingot version of this alloy. The blade’s unmistakable profile pays homage to the iconic weapon that inspired it, while adding a long, unsharpened swedge to ensure an acute point. For maximum strength and a deft balance, the gracefully curved blade has a tapered full tang that is flanked by contoured black G-10 scales. Like its historical inspiration, the Darn Dao’s handle flares at the pommel to ensure a positive grip during high-speed manipulation. It also features a generously sized lined hole for the easy attachment of a lanyard and a modern integral double guard.

The Darn Dao comes complete with a high-quality zippered storage pouch and a handsome leather sheath with an integral loop for belt carry. The sheath’s open-backed construction and thumb-break-style snap ensure positive retention, while still allowing a swift draw.

This amazing knife is also unique in that it is Spyderco’s second “Flash Batch” product. Like our Sprint Runs, which are unique, limited-edition production runs of either current models or classic, discontinued designs, a Flash Batch is a truly distinctive, one-time-only event. A Flash Batch, however, showcases a brand new design that has not been previously produced and will never be duplicated in the exact same form again. To make them even more unique and collectible, Flash Batches are individually serialized with a laser-engraved number on every blade.

The FB41 Darn Dao in Spyderco's online catalog.


The FB41 is made in Taichung, Taiwan and features:

  • padded, zippered pouch
  • full tang
  • unsharpened swedge
  • lanyard hole
  • modern integral double guard
SKU Handle Edge Steel From/To MSRP Note Number made Grind Sheath Clip Collectors club
FB41GP Contoured black G-10 PE Satin CPM-154 Dec 2017- 649.95$ (2018) Each knife is individually numbered. 1200 Full Flat Brown Leather Leather belt loop Main

Most collectible variation

Questions regarding collecting the FB41

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Technical information

Measurements (mm and grams) of the FB41 Darn Dao:

Variation Length overall Length blade Length edge Hole Ø Blade thickness Weight
FB41GP 413mm 270mm 250mm (PE) 6.0mm 522g

Measurements (inches and ounces) of the FB41 Darn Dao:

Variation Length overall Length blade Length edge Hole Ø Blade thickness Weight
FB41GP 16.27" 10.63" 9.86" 0.236" 18.4oz