Hello.
Maybe it'll be mor convinient to add link to next and previous period by value if you add a lot of year-to-year coins. There's “see also” sometimes, but not always. Yes, I can use search by value and lettering , but I think it'll be easier to click “next” from first period coin and go to second period.
For example: I add 40 danish 10 ore coins from 1948 to 1988 from three periods, so I should go to search page everytime or use several tabs.