The Henry double rifle, commissioned by Queen Victoria as a Christmas present for John Brown, has been bought by the National Museum of Scotland and will be displayed in public for the first time this summer, from 26th June until November.

https://www.scottishfield.co.uk/culture/a-historic-weapon-goes-on-show-for-first-time/?

https://www.nms.ac.uk/wildandmajestic

I have a letter from Henry to Brown dated 1876, where he suggests Brown should bring his rifle with him to Edinburgh, for it to be serviced.
Queen Victoria was on a royal visit to unveil the Prince Albert Memorial in Charlotte Square, Edinburgh.