A seller gave this info:
"This is an Eddy Merckx Century 653 Frame and Fork set in Team GAN color with 58cm frame size.I recognize that it says corsa extra on the top tube, but I was offered reliable info from thr EM museum that this is actually a Century model, only done a couple years with Reynolds 653 tubing. It was built in 88/89 and sent back to the EM factory for a repaint in the late 90’s where it got the GAN paint job."
Seat tube - 57cm c-c
Top tube 57cm c-c"

On the left of the bottom bracket shell is only an H
On the right of the bottom bracket shell is B and under the B is 858
Rear OLD is 130
(another 653 Century I saw posted was reported to be 126 OLD)
I don't have enough posts to post pictures here, but there's a couple in my album for this forum.