Regarding the metalwork, the lighter itself and the 'cup' it sits in look to be made of stainless steel, they are certainly a silver coloured metal. They then sit in the 'end cap' which is made of thin metal sheet with a yellow surface finish, in places I can see that this finish is a little worn and I would guess it is a white or silver metal underneath. The base of the lighter and the base of the ashtray are made of the same material.
I really wish they were made of silver, maybe next time.
The marks look to be the same on each item, I am fairly sure that the number is 300 but the smaller punched mark seems to lose all definition when enlarged. On close inspection I am beginning to think that the smaller mark may not be a series of letters or numbers but it may be just a shaped punch or possibly a simple picture in relief.
In relation to country of manufacture, it might be reasonable to assume as the retailer is in Italy then so were the manufacturer(s). However, they were probably bought from a supplier and then branded with each retailers own name and the country of manufacture could easily have been elsewhere. There must be a variety of possibilities, I think I may eventually have to contact the retailer after all and see if they can help.
Thanks to all for your comments and help.
John.