---
title: "Omega Constellation Megasonic 720Hz 36mm Stainless Steel Silver Dial 398.0820 1979"
type: "product"
brand: "James Ross Jewellers"
model: "Constellation Megasonic 720Hz"
reference: "398.0820"
price: 1795
currency: "GBP"
condition: "Pre-owned"
year: 1979
category: "Watches"
subcategory: "Omega"
availability: "In Stock"
url: "https://jamesrossjewellers.co.uk/omega-constellation-megasonic-720hz-36mm-stainless-steel-silver-dial-3980820-1979-jrw-361"
image: "https://jamesrossjewellers.co.uk/uploads/original_image/1def1847c84c0e89e8366d3bcf57d2b9.jpeg"
updated: "2026-10-17"
---

# Omega Constellation Megasonic 720Hz 36mm Stainless Steel Silver Dial 398.0820 1979

## Price

**£1,795** (Finance available from £168.88/month)

## Description

This rare 1979 Omega Constellation Megasonic 720Hz, reference 398.0820, is a fascinating example of Omega's pioneering electronic watchmaking. Featuring a distinctive 36mm × 40mm stainless steel cushion-shaped case, elegant silver dial with day/date display and original integrated Omega bracelet, this remarkable vintage timepiece is powered by Omega's innovative 720Hz electronic movement.Presented in excellent vintage condition, the watch has been fully serviced and comes with a two-year guarantee. Supplied with its original Omega box, outer packaging, instruction booklet and dated guarantee paperwork, it also features a special caseback engraving commemorating 25 years of loyal service from 1954–1979, adding wonderful personal history and provenance.With decades of expertise and a trusted reputation, James Ross Jewellers proudly presents an exceptional collection of luxury and vintage watches.This watch has been checked against technical records to guarantee authenticity and a clean history.

## Specifications

| Specification | Value |
|---------------|-------|
| Brand | James Ross Jewellers |
| Reference Number | 398.0820 |
| Year | 1979 |
| Condition | Pre-owned |
| Dial Colour | Silver |
| Movement | Electronic  Omega Megasonic 720Hz |
| Serial | 36245801 |
| Gender | Gents |
| Box | Authentic Box |
| Bezel material | Stainless Steel |
| Material | Stainless Steel |
| Keywords | Omega Megasonic 720Hz, Omega Constellation 398.0820, Vintage Omega Constellation, Omega Electronic Watch, Omega Megasonic 1979, Rare Omega Watch |
| Papers | Yes |
| Strap design | Stainless Steel |
| Model | Constellation Megasonic 720Hz |
| Case Size | 36mm |

## About The Diamond Box

The Diamond Box is North London's distinguished destination for luxury watches and gold jewellery since 1997. Visit us at 114 Ballards Lane, N3 2DN, London or call 020 8838 3655.


[View this product on our website](https://jamesrossjewellers.co.uk/omega-constellation-megasonic-720hz-36mm-stainless-steel-silver-dial-3980820-1979-jrw-361)