Hi Gio, it is sadly often the case that the 73345 and 73445 Camaros are 'put-together' watches with non-original parts. The fact the movement is unsigned would normally indicate this. (you can see the full details of how an original 73345 should be here https://www.heuercamaro.com/models/73345-gold-plated )

There are also wide-ranging examples regarding the level of original and non-original parts. If the unsigned movement is the only thing incorrect, I would say it's not too much of an issue but of course it depends what else is not correct. Certainly it will have SOME bearing on value but it is difficult to say as will bother some potential purchasers more than others.

Regarding the engraving-it depends what it is and how it was inscribed but would normally be initials or a name of the person who received it. Personally I quite like them as it offers an insight into the history of the watch, but again some may be put off by it.

Hope the helps?

Steve