Large Antique Irish Crochet Lace Bertha Collar Hand Made Victorian Era

This is a hand made antique Irish crochet lace Bertha collar. The Bertha collar is a large collar that was used with a low cut dress during the Victorian era/ It is hand made and must have taken many, many hours to make. The collar measures 15 1/2 along the neck edge and 54 along the outside edge. Laid out flat, it measures 26 wide by 21 high. The collar was made in two pieces and joined down the middle (see last close-up photo). It is in very good condition with no noted defect - there is a tiny brownish mark in one place that Im sure would come out, very minor in any case.
This is a beautiful antique Irish crochet lace collar - large size, impressive!