Hollow ground chefs knife

These knives have a big hollow ground into the middle, this partly reduces weight, aids food release and is just pretty cool.  Heavily hammered forge finish on the spine 

Blade 
Materials:  EN42j (from Sheffield) and 15n20 pattern weld, 100 layers (ish) 
Length: 220mm
 
Spine Thickness
Heel: 4mm
Mid: 3mm
1cm from tip: 0.75
 
Width
Heel: 55mm
Mid: 45mm
Drop: 30mm
 
Handle
Materials: bog oak
Length: 150mm
Width: 20/25mm