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Aelle tubing - as I suspected - indicates that it is indeed an entry-level model. I don't think it's a leader since they were usually made from higher quality tubesets + as I mentioned before, afaik leaders have the round cut-out at the edge of the headtube lugs.
If you want to find out the model, google: "olmo aelle" and see if you can find info on what models used this tubeset. This olmo gran prix comes pretty close, although the decals indicate that it is older than yours: http://www.mytenspeeds.com/My_TenSpeeds_1/Bicycles_Table/Italian_Bicycles/Olmo_Bicycles/Olmo_GrandPrix_Orange/OlmoOrange_FullSide.jpg
dazzrie





Sig_Arlecchino
No cut-outs on the edge of the lugs, no panto on the seatstays and what appears to be not a chromed chainstay - seems to be an older entry-level model. The 105 group also points in that direction. A photo of the columbus sticker with the name of the tubeset would be helpful.
p.s. obviously the lugs have 'regular' cut outs, what i meant were the cut-outs on the edge of the lug as seen below. Afaik, this kind of cut-out was a feature of the high or top-range models like the sintex, competition, leader or my scatto (slx).