Longines UltraChron Ref.8383 Cal.6651 35.0mm 1974

Up for grabs is a timepiece that showcases Longines at its most innovative, the Ultra-Chron Ref.8383. Produced during the golden era of high-frequency watchmaking, it houses the brand’s automatic Cal.6651 , delivering exceptional precision for its time. Complemented by a beautifully aged dial in excellent condition, it offers both historical significance and everyday wearability.

In addition, this timepiece comes freshly serviced with all parts laid out by our professional watchmaker for all to see in the images above. Little to no other dealers do this and it’s a testament to full transparency here at Montre D’or. With the Cal.6651 inside running excellently as shown in the timegrapher reading above, just like it was when it left the factory nearly half a century ago.

DIAL:

• Original silver sunburst dial in excellent vintage condition
• Baton hands with applied hour indices
• Applied Longines logo and crisp original wording
• Date window at 3 o’clock with quickset feature
• Domed acrylic crystal

CASE:

• Classic Ultra-Chron case design with sharp lugs
• 35mm Diameter (excluding crown)/ 41mm Lug-to-lug / 10mm Thickness
• Professionally polished with all sharp edges intact
• Original Longines-signed crown at 3 o’clock

CASEBACK:

• Screwdown caseback with UltraChron symbol
• Professionally polished to perfect vintage condition
• Comes with plastic protective sticker as shown

MOVEMENT:

• Longines Cal. 6651 – Automatic self-winding movement
• 17 Jewels / ~44 Hour Power Reserve / 28,800 vph
• Movement freshly serviced and in excellent condition

STRAP:

• Handmade leather strap, colour and design can be changed upon request depending on availability
• Aftermarket Longines-signed stainless steel buckle

AFTERCARE PACKAGE:

• Comes with a black presentation box + silica gel
• Complimentary PolyWatch crystal polishing kit (for acrylic crystall)
• 6-month warranty (covers non-user damage only)
• Guarantee Certificate with full service details included
• Access to our exclusive post-warranty repair services
• 7-day return policy for peace of mind

SPECIFICS:

Maker: Longines

Model: Ultra-Chron

Year: 1974

Case Material: Stainless Steel

Reference: 8383-1

Movement Serial: 51224203

Caliber: 6651

Diameter: 35mm

Lug to lug: 41mm

Lug width: 18mm

Thickness: 10mm

Lume: NIL

Strap: Handmade leather strap

Box and papers: NIL

Accuracy: +1.0s/day

Movement type: Automatic

Crystal: Domed acrylic

Crown: Original Longines signed crown

Last service: July 2026

Free express tracked shipping provided. Delivery within Singapore in 1-2 working days. International shipping may take 2–12 working days depending on destination and will be shipped via FedEx/UPS/Aramex/SingPost

Do note respective custom duties might apply which includes the recent US tariffs and are the buyer’s responsibility.

Do note that for US bound shipments the PolyWatch polishing kit will not be included in order to mitigate customs delay due to new customs requirements

Countries that we do not ship to: Afghanistan, Belarus, the Central African Republic, Chad, Cuba, the Democratic Republic of the Congo, Eritrea, Iran, Iraq, Israel, Lebanon, Libya, North Korea, Oman, Pakistan, Russia, Somalia, South Sudan, Syria, Ukraine and the Crimea, Donetsk, and Luhansk regions of Ukraine.

This is a vintage timepiece and water resistance is not guaranteed. Please avoid contact with water or moisture. Store the watch with dry tissue or silica gel to preserve its condition. We are not liable for water damage post-purchase