This is a static resin prop replica of the phaser 2 used in Star Trek III. It has a removable phaser 1. I was informed by another yourprops member that this phaser appears to be a Richard Coyle style phaser. And that the charging port on the side may indicate a replica of the proto-type of this prop. (Item is no longer in my collection, but posting kept for informational puposes.)
More from Star Trek III: The Search for Spock (1984)