The "husband-hunting" bra has been manufactured by the international lingerie firm amid Japan's falling marriage rate and with the age of the average bride now 28 or over.
Triumph publicist Keiko Masuda said of the bra, which features a self-set counter: "First you decide your target time or deadline until marriage and the countdown clock will start.
"Once you find your life partner and get engaged, you have to insert the engagement ring into the slot and the clock stops and The Wedding March begins."
She added: "Japanese women are becoming more aggressive than men, working actively to make marriage happen, whereas in the past it was men who led women towards marriage. The roles have switched completely."
Husband Hunting Bra Live Demo Video
Japanese government statistics show nearly 57 per cent of women under 34 are unmarried and strategic marriage-hunting enterprises have blossomed.
Some 3,800 firms have Japanese match-making businesses, making a market for a beau-targeting bra a no-brainer. Once the wedding deal is done, though, the bra includes a holder for the family seal and a pen to sign a pre- or post-nuptial agreement.
