1961 Lancer Fender Tag

Hi,
Sorry, it isn`t the best quality picture. Body is 732, which checks out as it is a 2dr coupe. So far so good. Trim is 231 - which is supposed to be blue. The interior is red though. So either it has been redone or the source telling me 231 should be blue is wrong. Paint code is DW4. According to the same source that should mean blue saddle colour on a white car. But again, I do not know whether that source is trustworthy. What I have found nothing on is the options codes line above. What is A1, S2, Y1 and Z1 supposed to tell me?