I believe this stamp is Scott Design A14 (the design used for the 1878 rough perf 1/2 anna red (Sc. #75) and slate blue (Sc. #76) issues and the 1878-80 imperf 1/2 anna red (Sc. #80) and slate (Sc. #81) issues.
I believe the above information will allow you to ID the design in your catalogs.

The image is grey-brown and, unlike Design A14, has circles above and below the frame.
Scott Design A14 is used extensively in both regular issues and officials for the combined state "Jammu & Kashmir", but none are brown or grey or anything similar. Likewise, it was not used in the separate state "Jammu" and the state "Kashmir"
Can you help me identify it? Thanks!!