Hi,
I love those.
As someone has already said; a KR300.
I have one and would like to eventually get more.
I got lucky on my first. It came with a matching top box. I think they were both purchased at the same time and have been together since new.
That might just be the romantic in me, but they both have the same date of 1955.
Actually I started a thread here and should update it now that I'm cleaning up the top box...
By they way, you can find the date.
On mine it's down in front, on the cross member but close to the left wheel.
Here you can see the model number. Below that under the dolly flange is where the date will be. Just after "USA".
I'm no expert, but I would guess your box is from the 1940s to the early 1950s. 1941-49, maybe 50-ish. If that's true, now that I think about it, you might not find a date. I heard that Snap-on started dating boxes around the early 1950s. I don't know but that might guide your understanding of what you do or do not find.
If you are really desperate to sell your grandfather's box, I'll happily buy it from you.
We can meet half-way between my house and yours. Not sure where that might be. Oklahoma? West Texas??
Regardless, it's a nice tool box and from here, that looks like a good example.
