It's a lovely pitcher - but it is not old Classic Carnival Glass. It is a Contemporary item and it was made by the Imperial Glass Corp. in circa the 1970s. The mark you describe is the Imperial Glass mark - it's a letter G with the letter I through it. It does look like the arrow you describe.
The pattern was a "new" one rather than a re-issue. It's known as "Mayflower" and was inspired by Imperial's early (Classic Carnival) 474 pattern. The 1970s reissue had its own number - it was their #678.
You're right about the color - it is a smoky grey-blue. Very beautiful. Imperial called it "Peacock". Gorgeous iridescence.
A lovely item, and certainly collectible.