One of the reasons for dumping the Dansco 707 album concept was the fact that the slides are dangerous to the coins' surfaces, and the other was because it wasn't "expandable" enough.
Here's the question. Why weren't the later "arrows added" varieties included in the 7070, and don't you think they should be? The first time arrows were added, in 1853 was to signify a weight reduction because of rampant melting of the coins, and the second time they were added in 1873 was to signify once again, a change in weight, back to teh previous weight.
That would basically leave the seated sub-types as "no motto -no arrows at date", "no motto - arrows at date", "with motto - no arrows at date", and "with motto - arrows at date".
I intend to include those in my type set, along with the earliest "no stars" versions of the lesser denominations. I consider those significant enough differences to warrant another "type".
If there's not a hole in the 7070, it doesn't mean it's not an important variety.
Then there's the lincoln cents of 2009, the new union shield design, the newer nickels ... and the 7070 is becoming outdated all too quickly.
I have an old whitman folder, a type set of 20th century coins. It doesn't even include a
Kennedy half dollar because it was printed and sold before 1964.
Besides going forward .... what about the earlier federal issues? I'll never complete e type set of
US coins if I live to be a hundred, but ignoring a couple dozen types isn't the answer either.
Chance