My 0,0000000002 cents
When i showed my track bikes to Ugo De Rosa,he asked me if there was any seria on the bikes,then, he quickly corrected himself,as he told me that,back then,he wasnt yet numbering/codeing bikes,meanwhile,he told me that if these would be more recent bikes,he could tell me much more.Only thing i noticed is that there is a single file mark,on every single bb shell of those bikes(IIRC)I also noticed that the two bikes used by Moreno Argentin have diamond shaped chainstays,meanwhile,the one used by Gradi's,has more rounded,ovalized chainstays. Hope this helps
Teo Brandi FIrenze Italia