The Standard Catalog of Firearms states on values " Add 300 percent for police models with detachable magazines " They did make the Wood master with detachable magazines, and they were used in correction facilities and by the police. When I was just a lad ( a long time ago ) my best friends father, who was a deputy sheriff, had a Model 81, it had a detachable mag and he had a spare mag he carried in a spare hand made leather holster . He said the Sheriff Dept. had ordered three of them. So they are unique and rather scarce,