Oat - I have this machine myself and use it regularly. I received it from my grandmother who bought it brand new in 1958. I do have the original instruction manual and also the matching blue metal case that holds the attachments. The attachments manual is also here with me. The pictures you posted are exactly what I have, same model 303 other than mine is on a sewing machine table that stores the machine inside when not in use. And your serial number 4003 is slightly lower than mine. Let me know if I can help in any way to get you the information in the instruction book.