Many years ago (in the 20th century) I tatted this collar from a vintage pattern found in a reprint of Priscilla Tatting Book No. 2. The book I still have is from the Dover Needlework Series; the title on the cover is "Tatting Patterns" Julia E. Sanders.
I used size 10 DMC Cordonnet Special to make it, and followed the directions in the pattern exactly as given (or as best as I could understand them at the time).
My collar is not as curved in a circular shape as the picture of the model shown in the book. The only blocking I did with it when finished was to lay it out nicely and steam it. The photos in this post have been taken just as it was found stashed away several years in a box. (I'd forgotten where I had put it!)
Here is the collar worn over a sweater and tied in front with a ribbon.
By the way, the earrings in the picture are from an original pattern by Elena Kozinenko and her patterns are for sale in her Etsy shop FairyLaceAndMore.
Tatting blogger Frivole has been working on improving this pattern. Follow her progress at Le Blog de Frivole.