This is a tiny Single Pole / Double Throw (SPDT) switch. it measures:8.5x4x4mm with a 2.7mm tall lever. It can be used or resized for various purposes. The part number is: SS12D00G3. You can find them on eBay or AliExpress. This model was designed for fitment purposes for use with an upcoming project.
This model was designed from measurements taken from the datasheet & physical measurements to the actual part.