Grading Walker Halves

Welcome to the forums! Sounds like a fun purchase! I'm sure someone will chime in with some great resources, but here is what CCF offers for grading these.

* G4 Good - Rims are defined. Motto IN GOD WE TRUST readable.
* VG8 Very Good - Motto is distinct. About half of shirt lines at left are clear.
* F12 Fine - All skirt lines evident, but worn in spots. Details in sandal below motto are clear.
* VF20 Very Fine - Skirt lines sharp including leg area. Little wear on breast and right arm.
* EF40 Extremely Fine - All skirt lines bold.
* AU50 About Uncirculated - Slight trace of wear on head, knee and breast tips also on the claws and head.
* MS60 Uncirculated - No trace of wear. Light blemishes.
* MS63 Select Uncirculated - Some distracting contact marks or blemishes in prime focal areas. Luster may be impaired.
* MS65 Choice Uncirculated - No trace of wear. Barely noticeable blemishes.
* PF65 - Choice Brilliant surfaces with no noticeable blemishes or flaws. May have a few scattered barely noticeable marks or hairlines.

Oh and

A couple of obverse location to focus on: left sandal, left hand (look for definition here as many weak strikes show up here as a blob), skirt lines in all locations of skirt.
At least one dealer I've dealt with stated that he does not like to purchase slabbed Walkers from before 1930 because he thinks they are consistently overgraded. littleboy's explanation may be a different take on the same story.

Walkers are great. Have fun.

A couple books you may want to consider, to complement Photograde: 'The Official American Numismatic Association Grading Standards for United States coins' edited by Kenneth Bressett and 'Making the Grade' by Beth Deisher.

The former is generally considered THE standard grading guide and the latter is very similar, covering fewer series, but with better pictures.