I am missing the strap to my Sutton too. I haven't done anything to it, I'm not really sure if it will need any cleaning, at first glance it doesn't. I think when I get around to carrying it I will just grab the strap from my Sheridan Monticello. The hangtag is similar too. My Monticello was made in NYC but as I recall Hyacinth said they were made in Italy also. I could be remembering wrong, I should probably verify that one...but either way the texture and hardware is similar.
I think it's a different color than Butter, I think I've seen Butter, but this is a little darker and has a greenish tint to it. Here's a bad pic of it again:
http://forum.purseblog.com/coach/show-us-your-coach-secondhand-bargains-745615-22.html#post22147293
I almost carried her the other day, she was just a smidge too small for what I needed to carry. However, the green doesn't really show up. The color seems too bright for "Butter" though. Here's a pic of her that I posted upthread: