The value of any vintage or antique item is what it will sell for on the market. The condition of the item will play a big part in the resale value. Not all old items are considered valuable.
Storage and steamer trunks were popular in the 19th century to pack belongings for long journeys across the sea, much as we used luggage to travel today. Trunks covered in leather became popular in the late 1800s.
To find the value on the market for an antique or vintage trunk, obtain the services of a reputable dealer and get an appraisal in writing. Take the time to visit more than one dealer as the valuation may be different from one appraisal to the next. Get at least three appraisals before putting the item up for sale or accepting an offer.
An appraiser's should provide a written description of the item and it's current value. In some cases, there may be a charge for the appraisal.
In addition to visiting several dealers, online antique auction websites may sell similar trunks online and a comparison can be another valuable option to see what other trunks are selling for.
Sellers can find a professional appraiser in their area by going online to find a local member of the American Society of Appraisers, Appraisers Association of America or the International Society of Appraisers.