I have 3 humongous crystals Navy type COL-40068 holders. Frequencies are 35.545, 35.770, and 35.610 MHz. They have serial numbers and are made by Collins and the is a picture of the 3 at http://www.qsl.net/n0xy/rocks.jpg $10 each or the 3 for $25 . Thanks for looking Michael N0XY