Sunday in Thun: Yes Saurer, but they are not DUK's

In 1990 the Swiss town of Thun (STI) still had a few Saurer buses but despite the presence of similar named water-fowl these were not the once common under-floor engined DUK built between 1962-1973. Because of their more recent age and rear mounted engines these are much more like the PTT's greatly lamented RH type buses built between 1978-85. Apart from my interest in Post Buses I'm not so hot on other Swiss buses but these might have been of the type SH.