A bit of research on TB will make it clear that because of the bridge design, ALL violin basses like the Hofner take strings one size longer than the scale length.
In fact, almost all basses with a floating bridge and separate tailpiece take longer strings than the scale length.
To confirm, take a tape measure and check the distance from the nut to the actual string anchor point on the tailpiece
. Do not measure to the bridge. The result is your string length. Not all of them will tape out neatly at either 30" or 32", as some tailpieces aren't very far from the bridge.
Last night I replaced the strings on this early 70's Univox 30" scale bass. The strings installed were MID-scale
, or 32". Note that the anchor point on the tailpiece is about 2" past the bridge.