Number 241 is a watchmakers tool. Perhaps more properly, part of a
watchmakers tool. It is a hexagon anvil anvil. The small holes are
used to hold the shoulders of balance staffs while a stake with a hole
in it is used to rivet the staff to the wheel. The larger holes can
be used to riviet wheels to pinions in a similar manner.
The hole in the bottom suggests that this was part of or could be used
as part of) a "Staking tool". The stakes were guided plumbly over
the holes that cold be rotated under the guide.

You might want to check out this URL to see what the anvil alone and
the staking took look like.

http://shorinternational.com/JewelingStaking.htm


I forgot to ask, what are the slots for?