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Swanson's Okoume-faced plywood siding listing fixes stud spacing at 16 inches and specifies separate edge and field nailing.
The front and back veneers are Okoume hardwood around Douglas-fir center veneers. OSFM 8140-2137:0500 describes a 5-ply, 5-layer panel measuring 4 by 8 feet, with nominal 19/32-inch thickness and groove lengths of at least 4 inches. Keep that nominal designation and the veneer construction together when identifying the panel.
The wall uses nominal 2-by-4-inch studs at 16-inch centers. Its fastening schedule pairs 6d nails with 6-inch edge intervals and 12-inch field intervals. Panel selection and fastening belong to the same listed assembly; the species of the face veneer alone cannot identify the installation.
SFM 12-7A-1 is the stated test protocol. Check the proposed panel and wall detail against the exact listing, Swanson's installation instructions and its product data sheets. That review should carry the stud spacing and both nailing intervals through to the construction detail.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.