Q. Can you identify a dish marked Limoges -- Trenton, N.J.? A. Limoges of Trenton, N.J., was just a sample of the maker trying to duplicate or copy the fine work of that area in France. The name Trenton, N.J., would indicate it is not from France, and not as fine porcelain. Q. My husband's mother gave us a set of old Bavarian plates. Some of the edges are crooked. They were stood on edge for years: could that have caused it? A. No. Many of the early pieces of china had uneven edges. Q. Give a little information about Wavecrest glass and who made it. A. These decorative boxes and lampshades were made by the C. F. Munroe Glass Co. The firm never actually made glass, but bought blanks onto which it put beautiful decorations. The pieces were made in the United States from 1898 to 1930. Q. We have a very ugly clock which has the name Yorkshire. Please explain. A. It was a broad and rather ungainly shaped clock of the long-case style made in England in the late 1700s and early 1800s. Not many of them survive in this country. Q. We were given a high, carved chair or settee which is called Shaker furniture. Can you explain? A. If it is highly carved, heavily decorated and made of any wood other than pine, hickory or maple, it is not Shaker. All Shaker furniture was very plain. Sorry. Q. We have a glass dish that is frosted with a rose intaglio on it and has the mark of Verlys on it. Explain. A. It would have been made by the Helsey Glass Co. in Newark, Ohio, before 1955 when the firm went out of business. It is some of the finest glass in the United States. Q. I am puzzled about how antique dealers arrive at their prices. It seems no two of them are the same on an identical item. Why? A. Dealers usually up the value from 25 to 50 percent, depending on the scarcity of the item and its price to them. But the difference is in the price of the piece to the dealer. Some pay more, and some pay less. Q. What is the meaning of the mark: "R.S., Germany"? A. The mark was used by all potteries in Germany in 1873 to 1891. Q. Who was William Saufry? A. He was a Philadelphia cabinetmaker from 1722 to 1787. He's credited with making the best Philadephia furniture, usually found now only in museums. Q. Where were sugar and flour chests introduced in America? Are they strictly American? A. These metal-lined, box-like containers were introduced in Georgia, South Carolina and North Carolina. They protected the contents of the bins from moisture and from sticky fingers. Q. What is a Soho Lamp? A. The Crosse and Blackwell Grocer Supply Company had these small lamps made in the 1930s. A candle, which fitted into the opening of the glass-enclosed container, could be use for peering into dark corners. Candles could be raised and lowered with a thumb screw. They are rare and expensive. Q. We have a cranberry vase with a crimpled top in a silver holder. Is there any way of telling where it was made? A. With no mark other than that of the maker of the silver holder, it was likely made in the late 1880s in the New England states or in Europe. It's value would be high. Q. Can you give me the name of a good antique magazine? A. The Collector and sister publications from Kermit, Texas 79745, are very good. Q. Is there such a thing as a child's highchair which could be converted into a rocking chair? I had one, but people think I'm crazy. A. You are not crazy. That's possibly the most avidly sought of all highchairs. It was made around 1885, usually in oak. Some that could be converted to strollers had wheels attached.