My mystery horse in a shining glaze

I bought this big guy a few weeks ago from a lady who said it had been in her loft for umpteen years and she'd had it on display for years before that. It is unmarked, very shiny and glossy. The glazed white mane is gorgeous and I love the 'socks' on his feet. He's big too; 25 cm across and 20cm to his ears. What struck me most about him though is his eye. It's painted on in an unusual way I think but there's something familiar about it. I can't place it but I think he's a beaut. Does anybody know what he is or where he might be from?