Section 9--709. Priority

(a) Law  governing priority. Revised Article 9 determines the priority
  of conflicting claims to collateral. However, if the relative priorities
  of the claims were established before Revised Article  9  takes  effect,
  Former Article 9 determines priority.
    (b) Priority  if  security  interest becomes enforceable under Section   9--203. For purposes of Section 9--322(a), the priority  of  a  security
  interest  that  becomes  enforceable  under  Section  9--203  of Revised
  Article 9 dates from the time Revised Article  9  takes  effect  if  the
  security  interest is perfected under Revised Article 9 by the filing of
  a financing statement before Revised Article 9 takes effect which  would
  not  have  been  effective to perfect the security interest under Former
  Article 9. This  subsection  does  not  apply  to  conflicting  security
  interests  each  of which is perfected by the filing of such a financing
  statement.