When I opened ours up I saw the same thing,but after seeing a lot in the same condition I think its fair to say thats typical as far as the cases are concerned and nowt to worry about.
I would'nt worry about the rust on the webs either,are you planning to have the crank rebuilt sharky cos I think it would be wise.That was the general view when I asked for advise on the same subject.
here's how ours looked for comparison
quite normal. think the coating for the seals goes thjat colour with age ect. it feels like a fine finishing paper opposed to the bearing surfaces. think its like a key to hold the seals. cant explain very good but you get the idea. i have a crank with rust on the webs that needs reebuilding. anything thats un useable gets replaced anyhow, if the parts are available!!! bdk do the centre bit i believe?