One folder to last the next 40 years?
well, i think this would.
only because it would probably still be sitting right in the drawer
at the bottom of my edc list
some years back a senior relative
passed me his german made stag scales othello folding hunter.
it had a back-lock spear pointed blade
(looking a bit like this mikov knives model placed for illustration purpose)
and also a non locking saw blade.
story was, he bought it back in the 1970's
and he gave it to me, mint.
i had intended to keep it that way
and not use it.
however that was not to be.
as the back spring just gave way and snapped in two
whilst i open the blade with intentions to oil it.
so that now,
i just don't know how long a folder's back spring can actually last in storage.