if you were left with one custom folder...

[John T Wylie Jr]

For me , hands down , no doubt , Carson # 4

 

[rick melear]

For a folder it would be one of two. The first would be the only one I ever lost, a forged O1 by Wayne Valachovic. The one I still have by Bob Conley in ATS 34 with Impala handles and engraved bolsters.

 

[Win Heger]

I'm kinda with JTW on Carson as my choice. I'd make it a large Model 21, though, most useful blade design I ever carried. I would hope it's in the open position when it either corrodes or clogs with sand, then it will be a great fixed blade.

Win

 

[jdm61]

And one made from a type of steel that you could sharpen on a piece of coral. LOL

A fixed-blade would be much more handy in a deserted island scenario.