I also have a 175 ltd ed in sunburst orange. Its number is 000/175 which suggest that there are 176 175s. I understand (after looking at the Jap owners websites) that my VX was the first of the 175 and as such was used for some of the brochure shots. I also believe that there is another 175 in Sunburst orange and that one is in St Vincent in the Caribbean but I have no evidence. Other than that one I don't know how many orange 175s there are. Do you?
Incidently he is a link to the original owner (at the bottom of the web page)