That obsolete numbering (starting with the D Major, Op. 60) as #1, had the F Major Symphony numbered as 3, Op. 76 (its republication number). As I recall, Dvorak had been using another publisher (B&H?) when Brahms introduced him to Simrock. I'm not sure if the F Major Symphony had been published previously as Op. 24, or if that number was simply assigned by Dvorak, but he thought highly enough of the work to include it in his canon, unlike the first 4.