saddle -

after posting occurred to me that colour resembled layout dye employed in metal working. some brooks pros get a two digit date stamp and others do not.

noticed inverted clip. did you do this because of worn/damaged splines?

frame -

one thing your frame lacks which every other example of these i have seen exhibits is the fork crown cap with the cutout letter m for motobecane. it is there regardless if bike badged as motobecane, astra, orly or dynamax. makes me wonder if your bicycle was built without it or if it was removed at some point. the frame's crown is a nervex pattern nr. 4. here is an example badged as astra wearing its winged m fork crown cap:



it is not quite visible in your photos but i would expect frame to wear a plate style chainstay bridge. each example i have seen has had it.

all this bike work and you are a dad too, congratulations!