In my article on the Chrono Master line, I included this note about crowns:

‘A quick note about crowns – I can’t be absolutely definitive about crowns for all the Chrono Masters, since many of my reference pictures are straight ahead and only show the profile of the crown. I would think all crowns should be signed with the ‘C’ mark, rather than ‘CTZ’ – but otherwise please use the images in this article as a guide.’

Recently Max from Italy contacted me about his 1870 model (hand winding with date), from 1967 when Chrono Masters were first launched. Max noticed that the crown is plain, not signed, and he had found one or two other examples, from the same year with the same unmarked crown.  I have also found a couple more like this, suggesting that an unsigned crown, on this model at least, may be an original fitting. So I will update the Chrono Master article to include this information, with many thanks to Max 🙂

Max has also kindly allowed me to use photos of his watch, and as you can see it looks like a very ‘honest’ example, and, remarkably, still fitted to an original strap: