Well in Australia, we have had some interesting sizes outside normal world standards.
In Melbourne we had Kodak, Agfa and Ilford, all manufacturing and semi manufacturing product. All by the way, now gone.
During the late seventies Australia, along with quite a few other countries decided to go metric, which I believe was a world wide push.
The biggest local manufacturer by far, was Kodak. Now Kodak had the ear of local and federal governments for a couple of reasons, but the main reason was that they were an extremely big exporter of photographic materials. We are talking multi millions of dollars a year, it was seriously big business.
The Australian government came up with some interesting laws, which were designed to help the country become metric. Basically they banned importation of scales, weights, measures and machinery, unless it was completely metric.
There were a couple of notable exceptions; automobile speedometers were to have kilometres and miles, with kilometres being the larger and obvious scale one would read. The reasoning was that changing all speed signs around the country was going to take about 5 years in outback Australia. Some friends took a picture about 2 weeks ago of a road sign still in use in a very remote part of the country, with all distances still in miles, so five years has stretched a bit.
Automobile manufacturers were allowed to change the head of the bolt or nut to a metric size, but retain the original thread. This ruling was incredibly difficult, one had to be a magician to work out just what kind of thread was on the nut or bolt. Nuts and bolts have been a failure in this country with nuts and bolt supply shops in some instances selling either metric or imperial, a few sell both and some sell hybrids. The higher up the quality chain you go, the more metrification there is.
Kodak Australasia, started to metricate their paper product, no person I have spoken to really knew why they started to go down this route, but they did.
All of a sudden instead of 12x16 colour negative paper, we had 400mm by 500mm paper, 8x10 paper was changed to 200mm by 250mm. They then changed the B&W paper, the first size I saw that was changed was 8x10 to 200mm by 250mm.
This particular change in B&W paper size was a real problem. All of a sudden people doing contact sheets of their 35mm films found that in some instances the paper didnt, or couldnt be held in the contact frame without falling out.
Ilford Australia thought this was a brilliant opportunity, and, in a marketing coup, they informed schools that they were continuing to supply 4x6, 5x7 and 8x10 paper to ensure compatibility with all existing darkroom equipment and at the same time telling these same schools that they could purchase B&W paper in an A4 size, which for enlargements of the standard 35mm negative, is virtually identical in format.
This B&W paper size meant that Ilford and the schools were seen to be following government standards by going metric, and at the same time utilising existing equipment and thereby negating any requirement to purchase new equipment.
Im not too sure how long Kodak persevered with these metric sizes, but it seemed to me to be over within a short time, maybe a year, which was probably how long it took stock to depart shelves in shops.
Mick.