The answer might simply be "brown" which is what I was told when I got him.
Anyway I'm at my parent's for Christmas now and scanned in a few old photos so I could keep them with me. The horse in question is Baldur, he was my horse from around 1996 when I got him, until I sold him in around 2002 when I knew I'd be moving to another country.
I've not been able to keep a horse since then and I really miss it and him, but yeah, stuff happens. Atleast I'm riding again now.
Here's he (and a younger me, I'm 28 now) in his starting to shed out the winter coat, coat.
Still shedding out the coat, you can see he's a lot paler inside the ears.
Full body in the summer, don't crit the riding, this was over 10 years ago.
It's not visible in any of these photos but he had a stripe along his back. It didn't really stand out because the contrast wasn't big between the stripe and his general coat colour but it was there.
So yeah, I am rather curious about his possible colour genetics, is he just plain brown and if so where does the stripe, ear colour and darker legs and mane and tail come from?