If that's the case behind the machine, it's not a domed top. It's a luggage style case.
Very few of these old machines are worth a lot of money; most sell around here for about $30. However, what sets this machine apart from most is the decals -- both unusual decals, and decals in mint condition. Unless this is a collectible model (and I don't know what all the collectible models are), I would guess it might be worth $50 to $100. I do know the Egyptian decals are desirable from a collector's standpoint, so it might be worth more than that to a collector.
If you are diligent about searching eBay, you might be able to find a picture of this machine there. "Completed purchases" on eBay can give you an idea of actual value. These machines tend to sell for less on eBay because of shipping costs and the potential for damage in shipping. A Craigslist ad might be a better way to go if you can figure out a fair value for pricing.