The '85-P quarter appears with two different busts in the same year. The smaller one accounts for about .75% of mintage. Look at the distance between the E in LIBERTY and the top of Washington's head. It is scarce in Unc (probably fewer than 100 specimens).
There are fewer changes year to year in that era but I never studied these as closely so direct comparison is impossible for me. There are still numerous changes over the years in the silver coins.
Collectors who are interested in these design changes need to form a reference collection which is just extremely well struck and typical coins in at least XF condition. Look for coins struck from new dies under full pressure. Then you can just study the year to year changes with an 18x loupe. It's an eye-opening experience for some people but few seem to have much interest except in specific series like large cents where the changes are much greater and often within single years. In those days dies were individual and now each date is individual and die varieties tend to be much more subtle.
There are some major differences in the silver years within specific dates as well. The '56 to '64 quarters come with both type "a" and type "b" reverses. The '64 also appears with the reverse designed for clads. I'd be surprised if there aren't plenty more. The '77 to '84 quarters appear with both type "c" and type "d" reverses with a few of these being quite scarce and all are uncommon in Unc.
As a general statement this is something I'm aware of, but your insight is still certainly appreciated. I'm in the same boat and thought, perhaps, Kurt or someome else may have had the familiarity to do so.
Thank you. I'll have to take a look at the 2014 and 2015 Kennedys as I'm not that familiar with the more recent releases.
I've answered this one before. In 2000 the three zeros in the date required either more space between the neck and the rim or the font size would have to be made smaller. So they slightly reduced the size of the bust and took the opportunity to also move LIBERTY a little further from the rim. So yes the post 1999 dimes have a smaller bust than the pre 2000 coins. I don't know if there were size changes at other times in the series, but the change in 2000 was very noticeable.
Join the club. I'm most always wrong. I know quarters much better than dimes and clad dimes much better than silver dimes.