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There is a small variation. It seems that the early models have a small protrusion on the door hinge

There are three types of the windows rivet:
a) riveted

b) chisel riveted

c) unriveted

As Hugh mentioned it, there is a variation of the white interior. There is not only the difference in the colour but also in the shape. The white interior has a different attachment of the steering wheel and it has an extra protrusion.
Antonin

I have some good photos of my white interior Iso that show these details that I will post tomorrow

Great photos! Thanks, that may be as close as I ever get!

Jay

Here are the close up photos of my white interior Iso.

Very nice photos. Thanks Taxidad for comparision. It seems that bouth white interiors are the same.
Antonin

I have found another small unlisted casting variation. The later issues have a small protrusion on the inner side of the door pillar. It should fixed the plastic interior part.
Antonin