Found this from Jancis Robinson: "For long the dark, treacly, wood-matured wines of Scholtz Hermanos were the sole exported representatives from this historic appellation, but that bodega has now disappeared"
And this is the link to the Montilla bodega with PX wines from 1939 and 1945 (big though, of course): http://www.talbala.com/Vinos_Viejos.htm
Another paragraph that excellently summarises the situation:
"Málagas wine trade goes back to Roman times. Its winemakers guild, the oldest in Spain, was established in 1487, and for centuries Málaga wines made with Muscatel and Pedro Ximénez were among Spains most successful exports, but the phylloxera plague of last century and the increasing popularity of drier wines sent the region into a slow decline. The closure a few years ago of the citys most classic winery, Scholtz, saddened both friends and competitors."