If the M90 is the most common then I'm doing something horribly wrong

I own five of these. The GF-777 twice

But these are all pretty awesome boomboxes and I'd rather think that the most common is something more regular like a GF-8585 or so (though I for myself don't own one). But for me it's hard to tell 'cause here in Germany things look differently on the bay. Lots o' Telefunken Studios, no Conions. But actually lots o' GF-777s at the moment - and going for quite some money.