John,I have that album, in fact it's keyed here on the site. That is a standard 10-hole diatonic in the key of "G".
http://www.harmonicalessons.com/members/cdskeyed/cds_milteau_inspiration.php
NuclearFreddie tells me that Big Walter Horton was known, in his latter years, to sometimes play a G diatonic with an extra octave added below
That's news to me. I doubt a harmonica like that existed back in his day, it's possible, but I wouldn't think so. What he may mean is that Sonny Boy II and a few others occasionally played a 12-hole low "C". So, in 2nd Position, that is the key of "G". That sucker is low and worth having one to play with if you don't already own one-
http://www.harmonicastore.com/harm_tuning.shtml
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