Yeah, the Marshal is almost definitely going to be at level 300, and its SKIN at 350. The last increase on the current tier rewards is +50 from 200 to 250, and the pattern for rewards so far goes:
Apparel, Apparel, Ship, SKIN, Apparel, Apparel, Ship, SKIN, Apparel, Apparel, ???, ???
So I’d bet heavily on the next tiers being 300, 350, 400, and 500, increasing by +100 for the rest up to 1000 to have a total of 20 tiers. I made a prediction thread actually, complete with a cool graphic to show how I’m betting things might go for PD: [Project Discovery] Predictions for future Tier Rewards and Ranks