Heh, yeah. FWIW, from the Classiclightweights.uk website:

"The frame numbers are stamped at right angles at the top of the seat tube on the left hand side – usually a six figure number starting with 01, 02 and 03 on early models. The model type could be identified with the frame size which was stamped under the bottom bracket; i.e. MC 56, MS 60, TDF58 etc. "

http://www.classiclightweights.co.uk/frejus.html

It's hard to find the original specs on these bikes. I obtained an early Ambrosio bar and chromed stem for mine, from Aixaix.