As usual Our Archivist KR has responded with this:
Hi OMB.
This is the team that beat Wigan 22 – 11 at central park on the 2nd May
1959 to reach the Championship final ,it was played in front of a huge crowd
23.254 mainly Wigan supporters.
Hunslet went through to play St Helens at Odsal
on the 16th May.
Your Archivist K.