By Sebastian Tong
LONDON, June 2 (Reuters) - The unexpected magnitude of Slovakia's 15-percent upward revaluation of its crown last week may tempt some speculative plays on currency gains in other euro zone aspirants but analysts warn against what may seem like one-way bets.
Other EU convergence economies will allow their currencies to strengthen further to fend off inflationary pressures but will be constrained by a desire to keep their export industries competitive in the face of faltering global growth.
Slovakia raised the value of its crown last Wednesday, sparking off a rally in the free-floating currencies of European Union peers -- the Czech Republic, Hungary, Poland and Romania.
These countries saw their currencies rise between 0.3 and 1.7 percent versus the euro even though none is expected to join the euro as soon as Slovakia, which is due to adopt the single European currency in 2009.
Although Slovakia's revaluation suggests the European Central Bank would back these countries if they decided to let their currencies climb before euro adoption, analysts say other foreign exchange gains will be limited by economic fundamentals.
"Slovakia's strong level of entry into euro is near fair value for the currency because Slovakia has made huge productivity gains in the last few years. Other countries may not be able to make the same argument," said Claire Dissaux, global strategist at Millennium Global.
INFLATION IS NOT ENOUGH
Slovakia boosted the crown's <EURSKK=> central parity in the European Exchange Rate Mechanism (ERM-2) to 30.1260 per euro, saying this would help maintain macroeconomic stability in the run-up to it becoming the 16th member of the euro zone.
Though few expected its early timing or size, investors had bet on a strong conversion rate for the crown as Slovakia -- like the EU's 26 other members -- is grappling with inflation. "It's important to note that the revaluation did not happen due to inflation alone. Slovakia moved closer to what its equilibrium value was estimated to be," said Millennium's Dissaux.
The Czechs, the Polish and the Hungarians need to restructure their economies -- including improving labour mobility as well as industrial and agricultural productivity -- before joining the monetary union and will ensure their currencies remain competitive in the meantime.
None of these currencies are in the ERM-2 exchange rate regime -- required for at least two years before euro adoption.
Poland's zloty <EURPLN=> has gained nearly 7 percent versus the euro since the start of the year while the Czech crown <EURCZK=> has risen 6 percent.
"We're already beginning to hear complaints from exporters in the Czech Republic and Poland," notes Lars Christensen, Copenhagen-based Head of New Europe Research at Danske.
The Hungarian forint's <EURHUF=> comparatively modest gain of 5 percent in the year-to-date could mean that it is poised to outperform its regional peers in the coming months.
"The credibility of Hungary's central bank has improved with the recent rate hikes and the market is taking a positive view," said Goldman Sachs analyst Istvan Zsoldos.
He sees the forint rising to 225 against the euro in the next 12 months, up from its current 240 levels, and expects gains in the Czech crown to be curbed as inflationary pressures in the country abate.
Regional currencies will also consolidate in the coming weeks as foreign companies traditionally repatriate their earnings around summer, Zsoldos said.
"We could see about 2-3 billion euros leave each country as part of this process."
Slovakia's revaluation is not fuelling appreciation pressures in every euro zone aspirant.
EU Baltic members Lithuania, Estonia and Latvia, which have their currencies pegged to the euro, are unable to revalue their currencies due to their large current account deficits.
"The economic imbalances of these economies mean that the market is unlikely to be convinced they have the ability to support a strong exchange rate to the euro," said Raffaella Tenconi, an economist for Eastern Europe, Middle East and Africa at Dresdner Kleinwort. (Reporting by Sebastian Tong; Editing by George Obulutsa)