I have just worked through my penny websites adding a "return to top of page" function at the bottom of every page to save users scrolling all the way back to the top to get to the menu.
Hopefully it will be useful.
Very nice. Large coins such as crowns collect surface marks due to their extra weight. Your coin is better than most of the 1/2 crowns graded Ef/g EF. Also the leaves on the reverse are much better minted than most halfcrowns of a similar grade.