W4SZG Homebrewed Grip Dip Meter
Rufus Castles W4SZG built this grid dip meter, he made it to fit inside this old 1960s vintage childs toy Microscope box.
There's a set of coils to match each band marked on the tuning dial
As you can see Rufus was a master homebrewer.
A single tube which I believe is a 955, you can see it glowing
in the photo to the right.