Here's a very quick pic of the modern version of my Dad's half-whittler that I've been carrying for maybe 6 months. It's an astonishingly nice design, with blades that sharpen very easily, and it's very slim, due to only 1 back spring. It disappears in the pocket until you are ready to use it...
Cyprant,
Kudos to your grandfather, and I'm glad you have his pocketknife as a keepsake! My father also was a WW2
Infantry veteran, and I have his original Case 2-blade pocket knife that he used during the war.
Actually, the blades on your grandfather's knife are not very bad at all -- many...