Tiara “Hard-Top”

Swiss Watch Fair 1965
Outstanding scratch resistance qualities are gained by the ultra-hard finish of the case by galvanic treatment (it resists scratch pressures of more than 1000 Vickers), The Ultratherm crystal is also scratchproof. And waterproofing is guaranteed up to 20 atmospheres (more than 600 foot depth). (TIARA “Hard-Top”)