5513 with dial I cant classify

[rcwheeler]

The story I was told on this watch is that it is a 1977 given to my father in 1978 when he graduated high school. He then gave it to me when I graduated college, but not before sending it back to Rolex to have it "gone through". I have searched the 5513mattedial site and many others, but cannot find a dial that matches exactly. With the surrounds, without T<25, closed 6's, etc. So my question is, was this dial replaced when it was sent back to Rolex or is it just an uncommon dial? Thanks.