Field Special Grades were not separated from the Field Grades in the production records. They were all recorded simply as "Field".
I believe that the "Improved Field Grade" in 1939 included the single sighting plane rib. The single sighting plane rib option was priced at $5. However, the new rib became standard in 1940, and the Field Grade retail price increased from $45 (1939) to $49.
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