A late .455 Smith and Wesson was in it, but doesn't fit well. Loose fit and the barrel is too long.
Some photos:
https://www.milsurps.com/images/impo...stuff023-2.jpg
https://www.milsurps.com/images/impo...stuff024-2.jpg
https://www.milsurps.com/images/impo...stuff027-3.jpg
https://www.milsurps.com/images/impo...stuff026-3.jpg
Don't know anything further. Insights would be most welcome!