I saw this ancient bus yesterday, which was also referred to on
this page:
http://sgforums.com/forums/1279/topics/295511?page=11
Photo taken yesterday outside OG, in Bugis.

Does anybody know the story of this bus? The make, model,
or history behind it?
Its a Tata LPO1313/55 chassis, which is a chassis likely based
on the Mercedes Benz OF1313 chassis. There is also a high chance
that the body had been recycled from an older bus onto the then new
chassis, a bus of that age (1990) wouldn't look so old (the design
is a 1970s Soon Chow design), although there is still a
possiblility that Soon Chow was still producing such bodies
then.