No 10 ( just under 1/2 way for my cameras)
The Spy Watch Camera
Of all the cameras I have made over the years this would rank as one of my must keep cameras , making such a small working camera was a real challenge.
So if you have a cool 60k you could buy an 1890 Lancaster Spy Watch Camera
if you don't , why not buy a cheap pocket watch on eBay and make one for under $20
This little gem uses a small postage sized glass dry plate for recording the image.