I'm roughly halfway through the first-pass sorting of buffaloes. The tally is 2079. No exceptional finds yet.
For the last 1000 or so I stopped scrutinizing the dateless coins for secondary traits except to put aside the wavy ribbon coins, which I'll further examine later. I will go back through those dateless nickels very carefully at some point. I haven't given up hope of finding a 1916
DDO 
As I went I looked for the big varieties in readable-date coins ('37D 3 leg, '36D 3.5 leg, '35
DDR) but found none.
Of the 2079 buffs sorted so far:
- 23 dateless type 1 Phillys
- 6 dateless type 1 Denvers
- 3 dateless type 1 Sacs
- 1 readable 1913 type 2, but I suspect old whole-coin acid treatment
- only 39 pre-1920 coins with readable dates
- 337 readables from 1920-1929, the only date/mm not found in that range was 1921-S
- total number with readable dates 1272
I'm pretty sure I can ID dateless 1925 nickels by their ribbons (in addition to 1920, 1921, and 1924).
I really should do laundry and dishes now but looking at coins is much more enjoyable...