SDCL § 43-25-21: Corporate seal or acknowledgment as prima facie evidence of executing officer's authorization.

The corporate seal of any corporation attached to a deed, mortgage, assignment of mortgage, release of mortgage, or other instrument executed and acknowledged by any officer of such corporation is prima facie evidence that such officer was duly authorized to execute such instrument on behalf of such corporation. Likewise, a corporate acknowledgment attached to or made part of any deed, mortgage, assignment of mortgage, release of mortgage, or other instrument executed by any officer of such corporation is prima facie evidence that such officer was duly authorized to execute such instrument on behalf of such corporation.