ISO threading is very likely -- see if there are any 1.37x24 markings on the cups. If you have a known ISO lock ring, see if it spins on freely. If it binds, you probably have French or Swiss threading. For what it's worth, both of my Austrian bikes are ISO-threaded, but I have heard unconfirmed reports that Steyr-Daimler-Puch sometimes used French threading, so there was evidently not a national standard.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069