Pretty rare combo. I have only 2 x recorded in this TRIM line including yours. Its sister is only 461 PSN's apart, identical build configuration. Both 11/78 and part of the transition period between old and new colours between 9/78 and 11/78 (some new colours introduced early). There is also 1 x 2/79 1958-63C van in identical build configuration except for optional 3.55 diff. These 3 x combined are the only Sage Green Sandmans recorded too.