Unknown Pfaff? if you can identify it please comment.

I have just brought this machine off ebay (dont have it yet, these are the sellers pictures of the machine) it is in poor condition. I am unable to find any information or pictures on the net of another pfaff like this. the serial number is on the BACK of the machine and is 357591 and if there is a number on the backplate (hard to tell until i get it) it looks to be B or G but pfaff models B is not like this and i cant find a model G. it has a full length backplate and looks very much like a very early singer 15 rather than any pfaff's i can find. any help would be appreciated thanks.