How do I date this old quilt It is in perfect condtion?

Call quilt shops in your area and ask them to recommend quilt appraiser. In the meantime, do not store it in plastic or in direct sunlight. Fold or roll it with tissue paper to prevent creases. If you have a spare bedroom, you can store it as the maker intended - spread out on the bed.

A couple more suggestions: -- Make sure whatever paper you use for storing the quilt is acid free. Quilt shops (and sometimes Joann's) sell this speciality paper. -- I haven't found many useful quilt books at the public library (and my local one is quite large). Try the quilt stores and the large bookstores. In addition to books about dating quilts, look for books on block patterns -- sometimes these will give sources. (Sorry -- if I weren't travelling right now, I could give you some specific book titles). -- When you're at the quilt shop, ask if they have someone on staff or know of a local quilter who is knowledgeable in dating quilts and might give you some help for free. The age of some quilts can be obvious to an experienced person -- quilts from the twenties and thirties are sometimes pretty easy to identify. -- Contact a local quilt guild and ask the same question. I know in my guild there are two women whose opinion would be pretty accurate. That's probably true in many guilds. -- If you're talking to nonprofessionals, don't necessarily stop with the first opinion you receive. Remember that you usually get what you pay for. -- If anyone indicates that your quilt might be rare or valuable (like a red and green applique quilt from the mid 1800's), then you can contact an appraiser or....... -- Many state universities and museums have fabric departments whose staff can give you good info. If they charge a fee, it is usually less than an appraiser. -- If there's a good appraiser locally, don't rule out that possibility until you check on their fees. If you don't ask for a full blown appraisal and statement of value, they might give you info on your quilt's age at a much reduced price. -- Finally, make sure you have examined the quilt carefully for any information (signature, initials, date) that might be written in ink, embroidered, or even quilted in -- to examine the quilting, have someone hold the quilt up to a window on a bright day so you can see the quilting patterns. The older the quilt, the more likely you are to find info like this. Good luck.

American Quilting Society trains appraisers below is the link- Here's one good book on dating fabric. There lots out there, Dating Fabrics: A Color Guide 1800-1960 (Spiral-bound) by Eileen Trestain

I don't know what country you are in, but you could take a photo and send it to the American Museum in Bath, UK, or even the Victoria and Albert Museum, South Kensington, London. They have curators of textiles who could give you advice. Also, if there is a patterned fabrick on the back, take a picture of that as well.