Please be as specific as possible when letting us know what is missing or incorrect. For example, say "this game's trophy difficulty should be 8/10", with a link to a website corroborating this difficulty estimate (if possible), not "this game's trophy difficulty is wrong".
Hawker Sea Hawk Mk.100 (Rank 5 Germany) Premium account for 15 days 2000 Golden Eagles.
All premium vehicles allow you to earn increased Research Points and Silver Lions for each battle and comes furnished with all available modifications.
With a Premium account (also purchasable in the game for Golden Eagles) you will earn more Research Points and Silver Lions during each battle for a set amount of days. This is cumulative with bonuses from premium vehicles!