S.W. Silver was a company in the Cornhill district of London. They seem to have been active in the 1840's to 1860's (certainly may have been around much longer, but this period has the most references) They were an outfitter and contractor for clothes and supplies for emigrants to Australia and for military and sea-going officers, cadets, passengers. They may have gotten into this via the manufacture of waterproof clothing. I have a very old knife with their markings, it is a large knife that appears to be the forerunner of the Swiss army knife with multiple blades and accessories. Have also seen a brass compass, which falls well into the travel scheme. Als reference to floating matteresses and life preservers, cabin furniture, etc. So perhaps the vase was part of a packaged outfit for these types of customers. They did have a store in Liverpool as well. There London location was on Cornhill Street which one still finds between St Paul's and the Tower of London.
Blue
The 929 mark on a ring indicates that the ring is 92% silver. This helps to indicate the value of the product for sale.
2 to 4 $
About $27.
42cents
About $150.
US quarters made in 1964 and before have a silver value of about $5.13 as of today. They may have a higher value to a collector depending on their date and mint mark.
The 1937 5 mark is 90% silver. With later year being less down too about 60 percent.
About $3 for its silver content. A dealer will pay less.
Spot price would be about it
1957 is not a rare date for Washington quarters. Its value is based on the silver it contains -- as of 12/2008, about $2.50
They are used to mark an anchorage.