Posting from Rec.crafts.metalworking as always.
2647) Tool for cutting glass. Hardened roller in the pointed
corner (likely missing in the one imaged here), ball to tap
along the line made by the roller to produce a better fracture,
and three different size notches for gripping the glass
(matching the thickness of the glass) and applying force to
break the glass when close to the edge.
The square hole is likely to control the valve stem on a torch,
used perhaps to ease the breaking.
2648) These appear to be for steadying round object (likely glass
bottles) so they will not roll apart. The top two are for going
between layers of bottles (of different sizes, given the
different spacing of the notches), while the bottom-most one
goes under the bottom layer of objects, or perhaps over the top
layer if they are enclosed in a crate.
2649) For carrying (and hanging) a bundle of something like sticks, or
for lifting heavy cylinders such as perhaps rolls of metal for
machining in a machine shop.
2650) Tools to perhaps form pills, or to detonate percussion caps.
Not commercial, given the materials.
2651) Looks like a curtain pull, except too large and heavy. Perhaps
for theatrical curtains?
2652) The fipple for a very low pitched pipe (flute without holes to
select alternate notes)-- designed so it can be opened up and
cleaned out. Missing is the edge against which the air (or
steam) stream is directed -- likely a part of the main horn.
At a guess -- it is for something like a foghorn, and the
cleaning is likely needed because of birds building their nests
in the horn.
It looks like it is die cast of aluminum or zinc (or pot metal,
which is mostly zinc).
Now to post and then see what other have suggested.
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