Yes, you can have up to 5 as they don't stack.
1 on each character, 1 in vault.
You can hold a fifth in the postmaster, IF your inventory is full when it drops, it won't go to postmaster if you already have one in inventory tho.
English
-
Great info to know. Thanks bud. Just glad it's not just stopped once you've gotten it once.
-
My first was at 13th completion, 2nd at 20 something.