Take a look at this:
http://cgi.ebay.com/GRISWOLD-5-CAST-IRON-SKILLET-8-INCH_W0QQitemZ6199154919QQcategoryZ976QQrdZ1QQcmdZViewItemIf I'm guessing correctly, I'd say this is a griswold skillet produced after their sale to Wagner. I'm guessing based on the fact that the "erie" marking is missing and it has an inches mark on it.
Note the handle, it looks to be close to the late handle.
The early handle and the tab handle have teardrop shaped holes. The groove handle and the late handle have oval holes. The tab handle and the late handle have the same bevel leading up to the hole. The late handle and the groove handle have the same rounded top.
(warning, wild guess coming up!)
If I had to guess at the which came first, I'd put them in the following order based on the above evidence:
early handle, hinge tab handle, groove handle, late handle, then sold the company and the molds.
Reasoning goes like this, starting with the early handle. first they changed the bevel on the handle for the tabbed skillets but left the hole the same. Then they changed to a different handle (grooved) which incorporated a new hole and a rounder top of the handle, but after a while maybe found they had increased casting defects due to the narrower flow path in the mold with the grooved handle design, so they changed the handle again to the late handle to widen the flow path in the mold, but kept the hole the same shape and the rounder top. Then that same handle continued on the skillets after the sale to wagner.
They probably derived the original early handle design from their Victor line or their large block smooth bottom line, as the late Victor castings and large block smooth bottoms have a handle that looks a lot like the early small logo handles.
Of course it's all conjecture.