You need to have a qualified quilt appraiser determine the accurate worth of any quilt. To make sure you have a qualified appraiser they should be associated with AQS (American Quilter's Society) or a member of the Professional Association of Appraisers. Both have internet sites.
There is not enough information to determine whether or not the triangles are similar.
A calico quilt is a quilt made out of calico fabric.
Take it to a Veterinarian. And they can determine the age.
The thickness of the shell (lip) increases with the age. This is how you can determine the age of the conch.
A quilt block is an individual piece of fabric used to make the pattern of the quilt top. Many blocks are sewn together to create a quilt. Quilt pieces could be be called patches, or blocks. Usually a quilt block is assembled from several quilt pieces, though not always. They are sometimes called appliqué.
The thickness of the shell (lip) increases with the age. This is how you can determine the age of the conch.
a quilt
Quilt can be a noun (the item) or a verb (to make a quilt, quilting).
A quilt is a handmade blanket. "My grandmother gave me her favorite quilt last year."
Some conservators and historians refer to a quilt made by a slave as a "slave quilt."
The official state quilt of Alabama is the Pine Burr Quilt. It was designated as such in 1997.