Dear Tzaw1,
thanks very much for the most interesting and rare pics and for the efforts you have exerted in obtaining them. I bet many of our fellow forum members have never seen anything like that!
However the only picture that is eligible for my list of contra-props is the
Avro Lincoln RE339Gof 1951 with Armstrong Siddeley Pythons turboprops in the outer nacelles driving contra-rotating props.
(Besides the SX973 of course).
Nice job, great pics...
carson1934