Space travel watches
The name of this collection is maybe missleading. Namely, this collection consist of watches which are connected to human efforts in conquering the space in wider sense. Thus collection itself is not limited just to watches which were worn by humans in space, but one can also find here commemorative watches, reeditions of the original watches, even watches which are named after some detail from one of the space programs. Of course by this definition number of candidates which would belong to this collection is enormous and even though I have quite a lot of them, the collection is far from being even close to complete.