As Steve mentioned, we have no many knowledge or reference for ANH Tie and I don't know how many Ties were made at ANH era exactly.
In spite of the limitation, mystery for ANH Tie have been revealed by many guys who have eagle eye~
Steve and Kyuzo clearly demonstrated one of Vader's wingman is the Tie in Chronicle book through comparing the decals on Tie ball.
Now, I would like to suppose another guess...remained wingman is the Edlund Tie?
If we look at the production shot Jedimaster posted, the right wingman had no any decals and even dark grey marking...like Edlund Tie.
Here is another screenshot at Vader's wing damaged.
I'm not sure 100% but the right wingman's left wing was also damaged at that scene?
So, I guess that Edlund Tie is one of Vader's wingman?
Eric.