Germantown Tool Works
It means that its 2500
The 14K is the Gold content and the S and S either stands for Sterling Silver or it is a Maker's Mark.
Means pretty much a makers mark~you can google the mark or take a picture and upload to google~and search that way as well~
Proof mark.
probably a makers mark
silver mark 865
It's a makers mark standing for dazzlers think they are out of california
Not always the jewelry is stamped, however, no stamp doesnt mean it is not genuine.
C is for crosses, to mark out the points U is for units, the two axes need proper units T is for title, a title at the top of the page L is for Line of best fit, only use a ruler to join the axes in columns or column graphs A is for axes labeled, label the two axes such as date and time S is for scale, which has to be correct on both axes S is for size, it should take up more than half a page yay :D so glad I could help ... finding my old science book was to easy hope this wasn't too late :S
The mark for sterling silver is 925 which indicates 92.5% silver content.
Could be an inspector's mark, assembly mark, etc..
it most likely is a trade mark.