The handle of the brush is marked 925 and OBADIAH.
This comb, mirror, and brush has a hand engraved interlocking script monogram of ARK (in order); however, the A and K are smaller which indicates A is the first initial, K is the middle initial, and the larger R is the surname initial. We have only had a couple of Obadiah's items come through our shop, and this is a treasure to have.
D. Thomas Miniatures wrote a great article on Obadiah Fisher (1941-2005), the late Master Silversmith Artisan from Manhattan, NY, that is a must-read for anyone interested in exquisite handcrafted sterling silver miniature collectibles. This sterling dresser set would be quite an investment to begin your collection of artisan miniatures.
https://www.dthomasfineminiatures.com/post/the-remarkable-world-of-obadiah-fisher-master-miniature-silversmith