Some good advice here....... next time I need to replace a lost pen-knife I'll be back for a reminder.
Presently I have a huge, old steel carving knife that stays stuck in a joint next to the shed door (inside). Half of the blade has worn really narrow towards the tip where it has been resharpened over the years. It belonged to my grandfather and cut many a Sunday joint before making an idea trimming knife when I harvest leeks and other veg. The long narrow blade reaches into spaces well and makes cutting purple sprouting a doddle.
![happy :)](https://chat.allotment-garden.org/Smileys/green/smile.gif)
It's a thin and easy to sharpen blade - I'm very fond of it!