Embassy legalisation for use in Thailand
This corridor needs consular attestation, and the sequence is fixed. A private paper is notarised or certified; an Italian authority then legalizes the signature; the destination's mission in Italy attests what Italy did. To legalize documents for Thailand you need all three marks on one file, and none of them can be added out of turn afterwards.
Choosing between the two Sicilian desks
The signature at the foot of the page decides it. Public officials — a registrar at a comune, a head teacher, a health office clerk — send the paper to the Prefettura. Notaries and the courts send it to the Procura della Repubblica. Neither desk passes a misdirected file to the other, so a wrong guess costs a full leg of the chain and a return trip across the city.
The consular stage for Thailand
The second stage happens at the destination's mission in Italy, and it is the slower of the two by a wide margin. The mission checks the Italian mark, adds its own and takes a consular fee it sets itself. Nothing you do at the Palermo end speeds that up, which is why the sensible move is to reach the mission with days in hand rather than hours.
Cost and timing for a Sicilian file
Italy charges a €16 tax stamp per paper, with exemptions for some record types; the mission charges its own fee on top. The standard window is 10–15 business days and the express window is 3–5 business days, and both describe desk time only. From Palermo you are adding transit at both ends, so treat the published figures as a floor rather than a forecast.
Keeping the bundle intact
A mark applies to the file as it stood at that moment, so anything added later is outside it. If a translation is part of the job, it is sworn before a Tribunale first, with the asseverazione — the translator's signed statement of accuracy — bound to the original. Then the Italian mark and the consular mark cover the complete bundle, and nobody has to send it round twice. Treated as a single run, an embassy legalization for Thailand from Palermo costs one trip to each desk.