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@bq
That is the 4 speed FG dynohub. It's the best kind, based on the FW. Other types are the AG (3 speed, based on the AW) and the GH6 - a front wheel dynamo.
Make sure you don't separate the dynamo from its keeper ring, or you'll kill it. Leave that bit alone.
The gearbox part will probably be in great condition - just need cleaning and fresh grease/ gear oil.
I have overhauled an AW 3 speed and that was all it needed. Magnificent piece of engineering. All the info I needed was on the sturmey heritage site. Tony Hadland's site is also a good resource - find it via Sheldon.
Watch out for small springs and bits flying about and getting lost, but other than that it's just a 3 dimensional jigsaw.