The design is crude and the chasing quality is poor.
Calligraphic Japanese or Chinese
Possibly Red Spiny Oyster,but the photo is not clear enough to tell.
There are thousands of jewelry pieces with uncut diamonds,some going back centuries....
So,it's a generic cast 10k ring with a synthetic ruby.One with a maker's mark like thousands of others not listed anywhere.
It's a "meerschaum bull's head pipe" there's a number of them on Google images.
Looks like a Palco Boy Scout Knife, Fork and Spoon Pocket Knife.
Looks like it had a "satin" finish to start with and whoever owned it had a compulsive habit of rubbing it in one location with their thumb for years.
Why tap? Just hold the "ctrl"key down and use the mouse wheel to change the size.
The curve described by a uniform chain hanging from two supports in a uniform gravitational field is called a catenary, a name apparently coined...
splice
Impossible to tell.
Most likely some type of "power tool" with hundreds of years of history..... hand,foot,water,electricity,etc.
No one stopped making pap boats .......... http://www.replacements.com/webquote/kiswil.htm
It was no problem ordering from Geiger's,Alpha Supply and any hobbyist jewelry/lapidary supply store even 50 years ago. Lapidary Journal,Gems and...
Yes they do,most class room settings have a wide variety of sterling/gold stamps.Hobbyist,gem and mineral clubs,military bases and the list can go...
High school/beginning college students can make lost wax castings as well as this one,it's nothing special.
That much mercury would close an entire school these days if spilled on a floor.
Looks more like travertine/Mexican onyx.
The frame shouldn't be holding the "2" lenses together,either the bifocal is fused to the lens or it was "glued",if they separate then the "glue"...
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