BY23 Tern

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The BY23 Tern is a folding knife that features two non-locking blades.

Appearance in catalogs

The BY23 Tern appeared in the following catalogs:


Sal Glesser

History, mentionings from the forums etc.

Information from the Spyderco catalog on the web


TThe BY23 byrd Tern is a non-locking folder. Folding knives with blades that don't lock open are in many cases the only legal-carry pocketknife option in countries and cities where restrictions have been adopted forbidding carrying folding knives with locking blades. As more counties enact strict knife laws, the concept of non-locking knives continues gaining momentum.

The Tern has a black G-10 handle resistant to warping and fading. The blade is held in the open position during cutting by a notched-joint at the knife's pivot. When closing the blade, the notch produces resistance functionally similar to traditional slip-joint penknife. To enhance control and comfort there's a deep finger choil which jogs the index finger into position on the bottom of the blade directly under the thumb.

Placing the index finger in the choil, the finger acts as a stop, inhibiting the blade from closing when cutting and allows the user to choke-up closer to the cutting edge with comfort and dexterity. A wire clip positions the folder to carry deep in a pocket, tip-up and ready for use left or right-handed.

The Tern has an 8Cr13Mov leaf-shape full flat-ground blade available in a PlainEdge. The handle is assembled with screw-together construction.[1]


The a deep finger choil is made in China and features:

SKU Handle Edge(s) Steel From/To MSRP Note Number made Grind Clip Clip positions Collectors club
BY23 G-10 PE 8Cr13Mov 2011 - $53.00 (2022) N/A Full Flat Stainless wire clip LH/RH, TD/TU Main

Most collectible variation

Questions regarding collecting the BY21

Some interesting questions we are looking for an answer to:

Questions with an answer:

Technical information

Measurements (mm and grams) of the BY23 Tern

Variation Length overall Length closed Length blade Length edge Blade thickness Weight
BY23G 163mm 163mm 70mm 55mm 3.0mm 60g

Measurements (inches and ounces) of the BY23 Tern:

Variation Length overall Length closed Length blade Length edge Blade thickness Weight
BY23G 6.40" 3.65" 2.75" 2.17" 0.118" 2.1oz


  1. The BY23 Tern in Spyderco's online catalog


The BY23 Tern.