The red Decca label version has also Decca deadwax:
1: (stamped) XARL - 6619 - X (scribed) H ./. Ⅰ (stamped) Manufactured in Germany
2: (stamped) XARL - 6620 - X (scribed) H ./. Ⅰ (stamped) Manufactured in Germany
I expect the Nova label versions to have been re-cut, with stamped 6.$$* #s
The NOVA-Rolling-Stones-Records are all third Re-Issues. The first RE-issues have a red Label with 6.000000 catalogue nr. Originally NOVA was a Sub-Label of DECCA-Record-Company with Progressive-Music. The original labelstyle was a yellow Background with pink-coloured inscription of NOVA . The German Re-Issue NOVA-Label is yellow-green coloured and have a small NOVA-Inscription and the 6.0000 catalogue.