SN7400N Quad opamp which side is pin 1?


DW
 

https://groups.io/g/TekScopes/album?id=245683

Here is a rather unusual design at least for me. This chip contains both the notch and the circle, I want to say the notch is pin 1 but I am not 100% certain that might be the case, any thoughts? I am trying to be certain not to install it in reverse.

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