I dunno about model number, but that photo is definately a washer dryer - it has two lines of text to the left of the dials - washers have just one line.
Washers read 'Aquarius 900' etc, whereas the washer dryers say 'Aquarius 900 Washer Dryer' etc over two lines.
Also, it has the outer clear plastic on the door aswell as the glass, which points at it being a washer-dryer. The only washers to feature this were the Ultimas with info-bubble display, not the lower Aquarius models that this one is.
Not sure if Ricky was meant to say 'my old WD61' rather than 'WM61'.