The ancient Latin female name 'Helvetia' appears on all the postage stamps and coins of which European country?

Helvetia is the female national personification of Switzerland, officially Confœderatio Helvetica, the Swiss Confederation.

The allegory is typically pictured in a flowing gown, with a spear and a shield emblazoned with the Swiss flag, and commonly with braided hair, commonly with a wreath as a symbol of confederation. The name is a derivation of the ethnonym Helvetii, the name of the Gaulish tribe inhabiting the Swiss Plateau prior to the Roman conquest.

The Swiss Confederation continues to use the name in its Latin form when it is inappropriate or inconvenient to use any or all of its four official languages. Thus, the name appears on postage stamps, coins and other uses; the full name, Confœderatio Helvetica, is abbreviated for uses such as the ISO 3166-1 alpha-2 and vehicle registration code CH, and the ccTLD, .ch.