There was a coupe of different types, depending on when and where they were from.
I've got couple of pairs of Solovair ones (without the stitching on the welt). These 6 hole ones are from before February '69 (according to the lad that got them as they were part of a stock that were transferred into storage that month and forgot about). Got the same ones in brown but they've had a lot of wear.
Interesting what you said about the change over to the black trim by 1970. Do you not remember mates buying them without white trim before then?
By '69, Hawkins were doing their range as well in many different heights. Plus there were others who'd licenced the Air Wear sole to use on their own variations.
They are similar to my boots so now I think mine were 6 holes. We only bought Martens, with the yellow stitching on the welt. All my mates had the same boot because we bought them at the same place (Blackman's) but other gangs had variations. I particularly liked the padded trim at the top. I reluctantly bought my second pair without the padded trim in 1970 and can remember Mr Blackman telling me that the old boots were out of production and replaced with the black (I think) trim. It might of been a sales pitch but I never saw the old style boots again. If I had I would have bought them. In 68/69 I also briefly wore brown officer boots with green drills from the Army and Navy store and some gangs stayed with this look but when we found out about the Squire shop we went in a different direction.