You may have read this erroneously-titled thread, where I thought I'd finally managed to get hold of a particular dial colour variant of J39908-70 (black with gold sub-dials) that had eluded me. It turned out to be another example of the blue dial with gold-sub-dials - and frankly not in much better condition than the one I already had in my collection.
In hindsight, looking back at the Spanish seller's photos again, even in the small Milanuncios listing images, which I first saw, there was a definite blue tinge to the dial.