[CR] Identifying a Merckx frame

Hi All.

Need help identifying a Merckx track frame-Columbus tubing, Merckx ends, Campy drops. I suspect it's from the late 70's to early 80's.

The serial number stamped on the bottom of the shell is: "A" (on left edge) and then "6921" (on the right edge) and there's an "F" above the "6291".

I'll have pics of the actual frame up soon but here are a couple links that might help.

The frame looks nearly identical to this one: http://www.bulgier.net/pics/bike/Catalogs/eddy_merckx/11.jpg

The only difference between this and the one I have is that the seat tube cluster looks more like this one : http://www.bulgier.net/pics/bike/Catalogs/eddy_merckx2/6.jpg (with with EM engraving and higher binder bolt setting).

Also different than the first pic is that the fork I have has a sloped crown (like the one second pic) but without drilling for a brake (it does seem to be tapped though, seemingly in production since it has been chromed over.

Let me know your thoughts. Any bit of information helps.

Mark Buswell
San Francisco, CA