Letters DEM stamped on Inland stock

[Bill Hollinger]

Welcome to milsurps.com. You will find there are some of the best and most knowledgeable folks here on the forums. We look forward to assisting you in any way possible

The stamping may be an arsenal ID or it could be possible it belonged to a police department somewhere. Another factor may be an owner once applied the stamp for his initials. Detailed photos would be a big help in identification.