Short answer: a "replica 1735 platinum" is almost never platinum, and it is never a functioning grand complication. What you get is a tribute case and dial, usually 316L steel with a bright rhodium or platinum-tone finish, bolted to a quartz or basic automatic movement. Subdials are often decorative. Prices run from about $150 to $900 depending on how much of the dial actually works.
Platinum is the first thing to test
Platinum runs about 21.4 g/cm3. Steel sits near 7.9. A solid platinum case in this size would weigh roughly two and a half times its steel twin, and nobody is machining PT950 for a few hundred dollars. Real pieces carry a hallmark, stamped as PT950, 950 Plat or PLAT, usually inside the caseback along with a maker's mark. If a listing shows a smooth caseback with no stamps, treat the word platinum as a color description.
Some sellers use tungsten alloy to fake heft. Tungsten carbide lands around 15.6 g/cm3, which feels close enough in the hand that plenty of buyers fall for it. Weight alone proves nothing. Weigh it, then look for the hallmark.
What the complications do on a replica
The original reference 1735 packs a minute repeater, perpetual calendar, split-seconds chronograph and tourbillon into one movement, and it was built in tiny numbers across a few metals. Platinum examples surface at auction only now and then. No replica factory is reproducing that. What usually happens:
- Perpetual calendar: a standard annual or simple date wheel behind printed subdials. February 29 will break it.
- Moon phase: a 29.5-day disc is easy to copy and often the only subdial that truly moves.
- Minute repeater: if you hear chimes at all, it is a buzzer on a quartz board, not a rack and snail.
- Tourbillon: this one can be genuine. Chinese ST8000-family carriages are real tourbillons and show up in higher-priced reps. Check that the cage spins once a minute and carries the seconds hand.
Movement options you will see
- Quartz with a screwed-on decorative rotor plate. Thin, light, silent.
- Miyota 9015 or Seagull ST21 automatic, 21,600 bph, no complications beyond date.
- Modular add-ons: stacked discs and a fake chronograph hand driven by the running seconds.
- Real tourbillon, usually $600 and up, still with decorative calendar work.
Case, dial and finishing checks
The case sits around 36mm, so a rep that measures 42mm is not even pretending to be the same watch. Ask for caliper photos. Then check thickness at the caseback, since stacked decorative modules add depth. On the dial, look at how the printing sits under magnification, whether the indices are applied or glued-on stickers, and whether the moon phase disc is photo-printed or engraved. Sapphire should pass a water-drop test; mineral glass will not.
When I look at one of these listings, the caseback engraving is where I start. Fonts on replicas are usually too wide, too deep, or spaced wrong, and the hallmark is missing entirely.
Prices and red flags
Under $150 means plated brass, mineral glass and quartz. Around $250 to $500 gets you a steel case, an honest automatic and subdials that look right but do little. Above $600 you are paying for a real tourbillon or a tungsten case, and even then the metal is not platinum.
Walk away from any seller claiming solid platinum, a genuine Patek movement, or 27 working complications at $300. Stock photos of the authentic watch are another tell. Ask for a short video with the crown pulled and the movement shot before money changes hands.
Bottom line
Buy a replica 1735 because you like the look of a classic grand complication on the wrist, not because you think you are getting platinum or a repeater. If the dial layout and the size are right and the seller is honest about the movement, it can be a fun wear. If the listing leans on the word platinum to justify the price, that is the whole pitch, and it is empty.