Here is another find from SOAR kiloware. This stamp has a local cancel, so it has been taken from a large envelope or a parcel which was locally cancelled by a mail clerk at his/her station.
The thermal printing is absent, and there is no indication that the stamp has been mechanically altered (scraped). Long wave UV light shows no changes to the paper surface.
Could the stamp have been chemically treated to remove thermal printing, or was it applied to the envelope/parcel as an unprinted label? Thank you for your response.