Well, I've never seen one in "the briar", but have seen something similar in shape.
The OD designates Own Design. This was used in the early days. Here's what I found on Pipedia...
O.D. "own design" - Denotes a pipe designed by the customer and carved to order. "O.D." stamped on shank. Not made after late 1920's or early 1930's. In 1950 a special series of "ODA" pipes was begun and continued through 1975. These were not carved to order.
Which doesn't meet with your 1984 pipe. Are you sure its a 1984 pipe?
The reason I ask that, is if using the "newer" dating from 1960, the 14 would date it as 1974.
Sorry I don't have much else, but will keep looking.