Hi, Jay, The key to this is finding other test pressings with the B/S rubber stamp. Steve -----Original Message----- From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf Of Jay Bruder Sent: Sunday, October 29, 2017 10:04 AM To: [log in to unmask] Subject: [ARSCLIST] original recording to test pressing timeline in 1949 ? Does anyone know how long it took to turn an original recording into a test pressing in the late 1940s? How long did each plating stage take? We are trying to assess the validity of a recording session date reported to have been held in Columbus on Thursday January 27, 1949 and a test pressing -presumably for Savoy in Newark- inspected the next Tuesday, February 1, 1949. Jay Bruder