Citrine Jewel Set Horse Adorned Filigree Seal-Birmingham Anchor but when was it made (W) ,by whom(J.R)?

by Audrey Diggins
(NSW-Australia)

Citrine Horse Seal HallmarksJR-Brimingham

Recently repaired ,as the horse feet had come off the filigree.The 'jeweller' took the stone out & when resetting it covered the hallmark with gold! I had taken some pics prior to his "fixing" job. I would appreciate any info on the now lost history. Has it devalued the piece?