When I said that it is possible to measure frame angles in a photograph I did not mean to suggest that it is necessarily easy. The photo must be taken from a suitable distance straight on, and must not have any rectilinear distortion. Fork blade angles are very tricky, the fork is almost always rotated at least slightly, as in the above image. I think one should be modest in one's expectations of precision. I would say that if the view is straight on, the wheels will appear perfectly round (rarely happens except in a careful studio setup with a view camera and commercial lenses). In that case one can measure frame angles to within a degree, and gross differences in geometry can certainly be detected and approximately quantified. I cannot tell in the above picture if the fork is bent.

Let's try to resist the temptation to pick out faults in others' bikes--it serves no purpose but to annoy. Sometimes such advice is couched in terms made to suggest that help is being offered, but it's nitpicking and devaluing just the same.

As for this strange period of PX10 production, there is little doubt that a much more aggressive geometry was used. It's seen in bikes from that period; it's seen in the brochures. It's not that subtle. I myself own PX10s from 1974, 1982, and 1987. The '74 is clearly the outlier in this regard.