In physics, resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies. The Armin Strom Mirrored Force takes advantage of this physics phenomenon and made two resonating balances to offer better stability of rate and higher precision, because two oscillators will tend to reinforce each other. This is an ingenious design. 43.5mm in 18k rose gold. Manual winding movement; caliber ARF15 with 48-hour power reserve. Limited to 50pcs. Priced at 67,000.00 US$