Your budgie is beautiful.
I'm sure some of our mutations experts will be along soon and will be happy to advise you with regard to his mutation.
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You'll find most of your basic questions are answered after you've read through all of them.
I think these are too much markings for a Spangle, Color is much paler for a Cobalt!
But about Spangle: The spangles we usually see these days are very much different from this one, But i remember from an article by Ghalib Al-Nasser that the "real" spangles are very hard to find these days and we have spoiled this beautiful mutation. Now what he calls "real" spangles are with much much more markings than what we see today! May be this is like those.
He looks very interesting and pretty! I think he is a Golden Face Cobalt but the way his markings get paler towards the flights makes me think of Texas Clearbody. He has quite strong body colour for a Clearbody though....
Are the markings definitely brown? In a Clearbody you would see close to black markings on the head fading to grey on the flights. The Yellow from the Golden Face may be altering the grey markings to look a bit brown though.