You need to get it professionally appraised, preferably by someone local.
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At Antique Clocks Priceguide, there are resources there to help you find how much the grandfather clock is worth. Besides pictures to browse through, there are appraisers that you can contact.
An antique grandfather clock will most likely turn up in the first antique store you visit. Although if there's no antique store in your neighborhood, you will also be able to find them online (where u might also want to use terms like Longcase Clock and Floor Clock).
The best place to find them would be online stores. Websites like eBay, TheClockSmiths, BcknTime, and ProClocks would all be good places to find authentic antique clock parts.
Find a good antique clock dealer in your area. He or she can refer you to a person who know how to repair or can do it for you.
There is many places to fix an antique mantle clock. The best would be to find a local clock repair that knows their stuff. If there is not an clock repair close to your area, you can always turn to the internet. After a quick search on google, you will find Dr.Time's clock repair, or a little further down you will find a guide to how you can fix it yourself. Always turn to google when looking for answers about an unknown subject.
Brass Bradley alarm clock made in Germany
Handmade cabinet hardware including handles and pulls can be difficult to find. However, antique handmade hardware can sometimes be found on Etsy and eBay. A company called Mood Australia also still makes handmade cabinet knobs from cattle horn and other natural materials.
Library, internet, Standard Catalog of Firearms.
you can get it from an appraiser or at some antique roadshows.
Being an antique, one won't find such a sofa in IKEA or Value CIty Furniture. The best place to find a unique antique sofa would be in the random antique shops scattered throughout the downtown and small town shopping centers.
The are some online websites that give values fo antique silverware. One of these websites is antiques.about.com. An excellent value guide for antique silverware is "Warman's Sterling Silver Flatware: Value & Identification Guide" by Phil Dreis. It is available on amazon.com for under $20.
To find the age and value of an old tapestry, consult an appraiser. An antique collectible may also be able to help you find this information.