It looks like to me that the grade 7 with "D" is a 6 blade. If i'm right, then here is a "fine" barrel with One "D".
Drew directs us to web site that appears to have another AH with 4 blade. It doesn't show the flats to confirm grade 6 but the engraving sure looks like grade 6.
I started out wanting to know the differnce between AH "finest" and BH "extra fine" and now I'm learning all sorts of new things. If some AH's used 4 blade, and it seems that may be the case, I wonder why? I guess there could be various reasons, eg no 6 blade in stock. Would a customer complain when he rec'd his new grade 6 with 4 blade barrels? Maybe if he was very fussy and new the difference. I assume a person ordering a 6 grade would have at the time no the difference since Parker and others adverised different qualities of damascus barrels.
All very interesting
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