Solid and could be repaired. For 280SL, 280S, 280SE, 280SEL, 300SEL with multiple stud mount.
Search the internet for steering wheel repair kits to fill these cracks. You can pay more and get a better one, but these wheels are getting harder to find as time passes. An open crack at the top of the wheel can be seen in the primary picture to the right.
Late W113 Late W108 and W109 Late W111 Black Steering Wheel - Some Open Cracks
$125.00
SKU:
USED-113SWCRACKS 
Product Details
There are cracks in the two side bars, as shown below. Sold as is and is not returnable.
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$395.00
Late W113 Late W108 and W109 Late W111 Black Steering Wheel - Excellent Used
No visible open cracks. A couple of slight flaws. For 280SL, 280S, 280SE, 280SEL, 300SEL with multiple stud mount.
It would not be easy to find a better one. It is not perfect, but it only has a couple of flaws, which are outlined below. Kent has had this in storage for over 20 years. It came with a low mileage W108 280SE 4.5.