looking at the catalogues I seem to have mixed up the numbers too mine should be a 110.501 yet the back says 150.501, also the same model featured in the 'comparisons' section is also marked 150.501 - and I have further seen two exact same models (no Monza on the dial, 12h) come up for sale in the last few months that are also marked 150.501 when the catalogues and the reference tables say it should be a 110.501 -

Were the photographs wrong in the catalogues ?

Did Heuer put any monza case back on their models ?