How much gold in Steel and Gold Watch 331.20.42.51.01.002 ?

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How much actual 18kt gold in grams in this Steel and Gold Speedmaster 331.20.42.51.01.002 ?
 
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18kt gold is twice as dense as SS. Looking at the current steel/gold Speedmasters and comparing weights to the all steel model there is about 46 gms or so of 18 kt gold, so say about 50 gms.
 
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18kt gold is twice as dense as SS. Looking at the current steel/gold Speedmasters and comparing weights to the all steel model there is about 46 gms or so of 18 kt gold, so say about 50 gms.
Isn't it also indicated on the hangtag like with the A11 50SS?
 
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Isn't it also indicated on the hangtag like with the A11 50SS?
I did not see it on the hang tag. The steel versions like

331.10.42.51.01.001 are about 8 gms lighter. I Was really curious the gram weigjt of 18kt gold.​