Frestonian Visa Stamp
To have your passport stamped with the Frestonian visa stamp was the ernest wish of every tourist to Frestonia. So the coachloads of Danish school kids, for instance, would get a quick 5-minute tour round the country, taking in the communal gardens with the mountain landscape painted on the corrugated iron, and the river and waterfall created by broken waterpipe, and then would get their postage stamps and the visa stamps in their passports and be off again.
Passports stamped with the visa caused no stir even for those subsequently entering the (then) Soviet Union, despite the close resemblance of the name to Estonia.