I recently received a pair of B&W bookshelf loudspeakers from a friend. She bought them when she lived in the Netherlands. She doesn't know the year or model number. All I can read is the speaker number written on a label on the back Nos. 13231 & 13232. They are black and have the dome tweeter on top. It is not the streamlined dome but a classic dome grill over the forward-facing tweeter. Can anyone help me identify the year and model of these?