Here's a shot of one I found on the inside of the caseback of a 1940s rolled gold pocket watch.
When I first opened it, there was a tiny white fluffy bush, radiating out from a central spot. I cleaned the caseback with a Towntalk cloth and noticed the etching into the surface plating that the fungusy growth had made.
View attachment 1236502
There were other spots, some not as well developed and all seeming to radiate from a small central spot.
Alien spores?
A sub-atomic city that I carelessly destroyed?
Old time watchmakers sneeze residue?
We shall never know.
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