Longines Ultra-Chron Jumbo Ref.8301-7 Cal.6651 37.0mm 1974

A superb example of Longines’s precision era, this 37.0mm Ultra-Chron Jumbo showcases a striking sunburst crosshair dial with faceted steel pencil hands, matching faceted hour indices, and its original domed acrylic crystal, preserving its timeless vintage appeal. Housed in a professionally polished stainless steel case with a signed Longines crown and Ultra-Chron screw-down caseback, it is powered by the legendary high-beat Cal.6651 automatic movement, beating at 28,800 bph and freshly serviced to run excellently, just as Longines intended.

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

• Silver sunburst dial with central crosshair
• Baton hands with matching faceted indices
• Applied Longines logo and “Ultra-Chron” text, both crisp and original
• Original Longines domed acrylic crystal

CASE

• Full stainless steel, professionally polished to retain its sharp edges
• 37.0mm (excluding crown) / 42.0mm lug-to-lug / 10.0 mm thickness
• Screw-down caseback featuring the original Ultra-Chron emblem
• Original Longines-signed coin edge crown

MOVEMENT

• Longines Caliber 6651 – Automatic high-beat movement
• 25 jewels / 40-hour power reserve / 28,800 bph
• Semi-quickset date (advance by rotating between 10 PM–12 AM)
• Movement serial: 50241112

STRAP AND BUCKLE

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

AFTERCARE PACKAGE

• Comes with a black presentation box + silica gel
• Free PolyWatch crystal polishing kit (for acrylic crystal only)
• Warranty card included with service history details
• 6-month warranty (non-user damage)
• Exclusive repair service post-warranty
• 7-day return policy for peace of mind

SPECIFICATIONS

Maker: Longines

Model: Ultra-Chron

Reference: 8301

Year: 1974

Caliber: Cal.6651

Serial Number: 51935998

Movement Type: Automatic High Beat

Case Material: Stainless Steel

Lume: NIL

Diameter: 37.0 mm

Lug-to-Lug: 42.0 mm

Thickness: 10.0 mm

Lug Width: 18.0 mm

Crystal: Original Domed Acrylic

Crown: Original Longines Signed

Strap: Handmade Leather

Clasp: Aftermarket Longines Stainless Steel

Original Box and Papers: NIL

Accuracy: ~0s/day

Last Service: July 2026

Free express tracked shipping with signature upon delivery. 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

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

Do note that for US and South America 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, 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.