Yep def no stamp...someones just scraped a 'H' in to the cylinder head

Head gasket looks new, im guessing, well praying, it was rebuilt and stamp was lost during clean OR its an uprated cylinder head .(im dreaming now ) ...i hope n pray it isn't fake..., block looks, fine it has RS plugs, and the bottom end has all the correct fixings, oil return etc....im sure there is a simple explanation