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Vintage Heuer Discussion Forum
The place for discussing 1930-1985 Heuer wristwatches, chronographs and dash-mounted timepieces. Online since May 2003.
Don't even think about it......almost impossible to do without damaging the case without the correct tool.
You do need a "Tool No 033" to do so, a specialised tool specific for this job.
You will see on the rear of your Monaco there are two slight openings near the lugs on the top / bottom of the case. This is the access point, and within the inner case corresponding to this point there are two small SS ball bearing type knotches that locate and lock the case.
I will send you a picture of an open Monaco to satisfy your interest.