Type VIID minelayer- superb kit. Do yourself a favour and get the new Griffon photo etch set for it. You will not regret it.
Theres huge difference in quality of old U-99 kit, and new type VII, and VIID from revell. Im surprised people still are getting the U-99 kit. It should be banned from shops. I had it once- my first sub, and it ended at the bottom of my fish tank, where covered with algae looked like sub wreck.