Art pottery is made by a single talented artist, a group of designers and artists who share the different steps, or a large company that has expensive machinery, men who make the molds, throw the clay and manage the hot ovens, and many talented designers and artists. Trial pieces are made that are eventually destroyed or sold after the final design has been determined.

In 2016, an auction at Humler & Nolan, a now-closed Cincinnati auction gallery, sold three very modern looking vases. The three “Ming Tree” vases, introduced in 1949, were auctioned each with a different trial glaze color. The blue gray vase with yellow and pink coraline-like foliage sold for $489, the light blue vase with pink and green foliage for $431, and the turquoise blue vase with white and green foliage for $401. They are all marked with the words “ROSEVILLE U.S.A.” in printed letters.

Was the price difference because the pale blue gray was most popular, because bidders preferred the colors of the coraline-like fragments, or because each bidder wanted only one vase and the winner didn’t continue bidding?

Q: My late mother had a business in ephemera, and we inherited her relatively large collection of postcards. Some of them are signed by Philip Boileau and marked “Reinthal & Newman, Pubs., N.Y.” We’re interested in selling the collection in total or in pieces. Can you suggest the best way to go about this?

A: Philip Boileau (1863-1917) was an artist who opened a studio in New York City in 1902. He was known for his portraits of beautiful women. His work appeared on postcards, prints, magazines, calendars and other items. Reinthal & Newman was a publisher of postcards and prints, in business in New York from 1906 to 1928. Most postcards sell for 25 cents or less or in groups of 25 or 30 cards for less than $10. Only a few sell for high prices. Since your mother was an ephemera dealer, she may have collected cards that are more valuable than most. Postcards with illustrations by Philip Boileau have sold recently for $1.50 to $6. Go to a postcard show and see what postcards like yours are selling for. Talk to the dealers and see if they’re interested in your collection. But don’t let them just pick out the best postcards and leave you with the rest, which will be harder to sell. You can find postcard shows by searching online.

Q: I have about 25 Nancy Drew mystery books that I got in the 1960s. They aren’t in the best shape, but I was wondering if they are popular collectibles. I’ve seen them along with the Hardy Boys in a lot of thrift stores.

A: Amateur sleuth Nancy Drew, along with her companions — “tomboy George” and “plump Beth” — started solving crimes in 1930 in the “Secret of the Old Clock.” The books are still popular. They were created by publisher Edward Stratemeyer as the female counterpart to his Hardy Boys series. They were ghostwritten by several authors under the pseudonym Carolyn Keene. Vintage Nancy Drew books cost $8 to $10 each in thrift stores and can still be bought new in bookstores.

Q: We bought an antique telephone and would like to know something about it. It’s engraved “1872 Edwards” in a triangle. We thought it was interesting but wonder if it has any value.

A: Robert Edwards and David Rousseau started Edwards and Co. in 1872. The company made igniters for gas fixtures and later made burglar alarms and electric doorbells. Alexander Graham Bell was granted the first patent for a telephone in 1876. The first telephones for private homes were made in 1877. Edwards and Co. made telephone call boxes, intercoms and signaling equipment, but we haven’t seen any Edwards telephones. You may have a call box or intercom phone that was attached to the wall and used to call servants. Edwards is now a brand owned by Carrier and makes fire alarm and hazard detection equipment. The value of your telephone intercom is low, under $50.

Q: I have a tote box full of J. & G. Meakin dinnerware. The pattern is Alpine Mist, white with blue flowers. I haven’t seen any of it in antiques stores or flea markets. I’d like to find out about the maker and if it’s valuable.

A: J. & G. Meakin was founded by brothers James and George Meakin in 1851. Much of the company’s pottery was made in England for export to the U.S. and other countries. The pottery was run by family members until 1958. It became part of the Wedgwood Group in 1970, and production stopped in 2000. A five-piece place setting of Meakin’s Alpine Mist was offered for sale for $25 online, dinner plates for $12 to $14 each, and a vegetable bowl for $18. It’s hard to sell large sets of dinnerware. You can try a local consignment shop to see if they can sell them, or donate the dishes to a charity and take the tax deduction.

Tip: Check the screws holding shelf brackets to the wall. Every time you add a new collectible, you add to the weight. Shelves may break from the strain.

On the block

Current prices are recorded from antiques shows, flea markets, sales and auctions throughout the United States. Prices vary in different locations because of local economic conditions.

Furniture, cedar chest, old red paint, dovetailed case, bracket feet, recessed iron handles on each side, American, circa 1875, 26 by 48 by 26 inches, $65.

Door knocker, figural, woman’s hand, bronze, holding ball, raised oval ring and cuff detail, ornate shaped backplate, Victorian, circa 1900, 5¼ by 1½ inches, $190.

Ridgways plate set, earthenware, hand-colored, horse-themed vignettes on center inside fluted band, white ground, flattened border with gold rim, stamped “Ridgways Old Ivory Bedford Ware / Made in England,” 10 inches, 20 piece, $250.

Tole tray, metal, two tiers, painted scene, figures on stone steps, woman drawing water, leaves, scrolls, reticulated rims, arched handle, England, circa 1900, 16 by 17 inches, $365.

Glass inkwell, blown, red roses and stems, frosted cracked ice ground with leaf pattern, domed lacquered brass lid, etched on bottom “Daum Nancy” and Cross of Lorraine, France, circa 1920, 5 by 3½ inches, $400.

Pottery vase, light green mottled glaze, tan glaze inside, ovoid form with curved shoulder, three arched strap handles extending from rim to shoulder, stamped with potter at wheel for Pisgah Forest Pottery, late 1920s, 13¾ inches, $500.

Brass firewood bucket, hammered and incised decoration, raised crest with plumed top and scrolling leaves, lion’s head masks and ring handles on sides, three hairy paw feet, England, 1800s, 29 by 26¾ inches, $820.

Pencil, retractable lead, 18K yellow gold, cobalt blue enamel, four synthetic sapphire cabochons, square button end with three-sided loop for hanging, stamped French eagle head hallmark, 3⅝ inches, $1,190.

Sterling silver flatware, Faneuil pattern, service for six, fitted wooden case, Tiffany & Co., 1910, 44 piece, $2,000.

Jewelry, pin, golf bag with clubs, 18K textured gold bag, diamonds on top band and handle, four clubs decorated with a ruby, emerald, sapphire and diamonds, marked “Hermes” with French gold assay marks, 2 by ⅞ inches, $3,100.