Another interesting buillding in Riverside is this Watch Case building.
This was the world's largest watch case manufacturer, doing business around the globe from the Philadelphia Watch Case Company Building.
I found some history here
which says this building was built in 1906 and this also lists the Case Grades they made.
is some information on the website for Riveside.
is an aerial view and some more pictures.
I don't know if all, but some of the watch cases were made of gold and I found some interesting notes on this link
(scroll down to the bottm). Here is what it says: "Ornate clock tower is the perfect symbol atop the seven-story office tower of The Philadelphia Watch Case Co. in Riverside, NJ. The factory, which produced gold watch cases, had 32 fire and burglar-proof vaults. Floors were sloped so gold particles could be flushed into a cistern and recovered
State Tag #87 Keystone Watch Case Co.
Philadelphia Watch Case Company @