The oldest historical game is Barnes-Paulsen (1862):
https://www.chess.com/games/view/969
LCS(NLA: Classical, Bird's: Dutch)
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May 3, 2017
0
#2
this opening can be useful
May 5, 2017
0
#4
jengaias wrote:
I don't understand one thing.
Why don't you open a blog to put all this , obviously absolutely useless info , about all these, obviously absolutely useless openings and lines.
Why flooding the forums?
Since when the NLA and Bird's opening became "useless" ?!? It's your whining post here that's really meaningless and useless.
Btw I don't flood this forum. When I'm motivated, I can post 1-2 topics per day. 
but U make a mistake by thinking that I wanna "see my name in the forums". I just participate at my own convenience.
The notion of least common successor is given here:
https://www.chess.com/forum/view/chess-openings/gcp-and-lch-of-2-pawn-structures
As an example, we can consider LCS of Nimzo-Larsen Attack: Classical Variation and Bird's Opening: Dutch Variation. We obtain the following nice but still unnamed opening
with pawn structure 2Fd1b: