PIV Band + Pebble Holder
Ready to wear

The Casio F-91W + Fitbit Air.
Retro icon. Hidden tracker.

The Fitbit Air sensor plus a watch that actually looks good. Skip the clunky fitness band. Slide your pebble into iconic Casio. Track everything. Look retro.

Already own a watch?
Get F-91W - $99.99
PIV F-91 — Casio F-91W with Fitbit Air pebble holder
PIV F-91
$99.99

The classic Casio F-91W fitted with a custom nylon band and Fitbit Air pebble holder. Iconic look, hidden tracking.

  • Casio F-91W base watch
  • Custom nylon band + pebble holder
  • Ships ready to wear
  • 7–10 day turnaround · Free shipping
  • Fitbit Air sensor pebble not included
Get F-91W - $99.99
PIV CA-53W — Casio calculator watch with Fitbit Air pebble holder
PIV CA-53W
$99.99

The Casio CA-53W calculator watch — same custom nylon band and Fitbit Air pebble holder. More character, same tracking.

  • Casio CA-53W base watch
  • Custom nylon band + pebble holder
  • Ships ready to wear
  • 7–10 day turnaround · Free shipping
  • Fitbit Air sensor pebble not included
Order CA-53W - $99.99
PIV Band + Pebble Holder — custom nylon band and Fitbit Air pebble holder
Already own a watch?
PIV Band + Pebble Holder
$29.99

The custom nylon band and Fitbit Air pebble holder. Works with any 18mm or 20mm lug watch you already own.

  • Custom nylon band
  • Fitbit Air pebble holder
  • Ships ready to install
  • $9.99 shipping
Order Band + Pebble Holder - $29.99
★★★★★

"The F-91W looks vintage Casio on the wrist, but it's tracking my steps, heart rate, and sleep. Perfect retro tech hybrid. My friends have no idea there's a Fitbit sensor in it."

S
Shain
Verified buyer
★★★★★

"I love the retro look, the design and the overall quality of the product! Got this as a gift for my boyfriend. He absolutely loves it!"

M
Mohana
Verified buyer

Select your product

Model PIV F-91
Ships in 3–5 business days
Shipping Free
Total $99.99

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Q
Why the F-91W?

It's the most iconic Casio ever made. Now with hidden fitness tracking.

Q
Do I need a Google Fitbit Air?

Yes. The sensor pebble is not included with your PIV watch. You remove it from your existing Fitbit Air band and slide it into the pebble holder. It pops in and out easily, so you can swap back whenever you like.

Q
Does the Fitbit Air work the same way?

Yes, fully. Heart rate, sleep tracking, and steps all sync through the Google Fit app as normal. Nothing changes on the software side.

Q
What do you sell?

Three products: the PIV Band + Pebble Holder ($29.99) which fits any 18mm or 20mm lug watch you already own, the PIV F-91 ($99.99) based on the Casio F-91W, and the PIV CA-53W ($99.99) based on the Casio CA-53W calculator watch. All include a custom nylon band and Fitbit Air pebble holder.

Q
How long does shipping take?

7 to 10 business days. We build each watch to order, so there is a short lead time before it ships. Shipping is free.

Q
Do you ship internationally?

Not at the moment. US orders only.

Q
What wrist size does it fit?

It fits all wrist sizes. The nylon band is adjustable and works on both smaller and larger wrists.

Q
Can I return it?

All sales are final. We are a small team building each watch to order, so we are unable to accept returns. If something arrives damaged or is not what you ordered, email hello@pivhq.com and we will make it right.