I used to do Calligraphery and that is definitely an "H" for the middle initial.

My take on the gun: It was shipped as normal and then sent to be engraved and Silver plated (think of normal birthday or Christmas gift). When somebody decided to present it to Mr. Currier, they had the grips "Customized". I would think if they were engraving specifically for presentation, the Name would have been engraved at that time! Or if engraved to be a off the shelf presentation piece they would have left a smooth side plate or back strap for the name.

Ivan