40 pages already!
I remember seeing the start of the topic, a while ago.
Besides an Axel track bike, I'm not in Merckx built bikes.
I prefer the earlier ones and own a Fiat team bike (team member passed away a year after selling me his frame)

Yesterday however, while hinting for another bike, I encountered a Merckx and despite knowing what it was, I took a picture of the bottom bracket

Merckx frame by bagheerabe, on Flickr

So, If I understood the game, this frame was built by mister A, size 54 and it should be in early 1981, potentially the 1069th frame? (what a gigantic production)

Am I correct?