1937 - A very nice VF-35. Very close to an EF, but the lack of detail in the tail and overall wear on the buffalo's body. 1936-D - AU all the way, only thing I don't like are the nicks in the rim 1913 - Solid F-12
Rim starting to merge with the letters, no visible horn, buffalo flat, thats a VG in my book. Others were XF and AU to me.
The 1935 Buffalo - the horn is almost non-existent, so that leans me towards G-4. But otherwise there are VG to F details. With the Liberty on the obverse touching the rim, and with some of the letters in United and Five Cents merging with the rim on the reverse, I would settle on VG-8.
Check these out. The slideshow has most of my buffalos. Any feedback about my grading is greatly appreciated. http://samscoins.photoshop.com