The Heuer Monaco was first launched in 1969 and was one of the first automatic chronographs ever manufactured. The present example differs slightly from the original reference 1133 and is commonly known as the economy version of the caliber 11. The updated caliber 15 replaced the 12 hours register with subsidiary seconds and had a lower retail price. In the early 1970's, Swiss watches export to the US dropped for the first time in 15 years and the US dollar also dropped significantly over the Swiss Franc, making Swiss watches even more expensive. Heuer, like many other brands, had to take action and the caliber 15 is the result of that action.

The present 1533G, with the 'G' indicating the grey dial, is preserved in lovely original condition.