Multiple material golf club head with crown scarf joint

A method comprising the steps of:

• providing a golf club head body comprising a striking face, a face extension extending from an upper edge of the striking face, a bond flange extending from the face extension, and a sole extending from a lower edge of the striking face;
• providing a crown comprising a scarf region with a front edge having a first thickness, a step portion having a second thickness that is greater than the first thickness, and a rear region having a third thickness, the scarf region gradually increasing in thickness from the front edge to the step portion;
• affixing the scarf region to the bond flange to form an upper golf club head surface;
• and
• grinding the upper golf club head surface only from a location proximate the front edge to a location proximate the step portion,
• wherein the step portion separates the scarf region from the rear region, and
• wherein no portion of the rear region is subject to the grinding step.