It may have been his grandfather's; Cornelius Van Schaack "C.V.S." Roosevelt and it sold in 2006.
https://www.collectorebooks.com/gregg01/pinfire/Lot-785.htm

[Linked Image from photos.smugmug.com]

[Linked Image from photos.smugmug.com]

[Linked Image from photos.smugmug.com]

Also discussed here it is on p. 16-17
https://issuu.com/booneandcrockettclub/docs/theodoreroosevelthuntercons