Another one I've had for 20+ years

[David]

Originally Posted by Marcokeris

widening a sheath to hold a blade is easy, tightening it without adding anything is a little more difficult

True, but from what i can see this blade's width is fairly narrow the base. If it fits perfectly in the sheath the likelihood it was made for the blade would be high i believe.
Though i personally enjoy a wrongko that has been well adapted with inserted wood to fit a smaller blade profile. It generally shows that the owner valued that sheath for some reason. I have a couple of nice wrongko like that which were refitted because they are well made from desirable wood.