MichaelG, Just looked at your album again and could read it by using the browser 'zoom in' a couple of times.
Sadly could not find the number 7538, there is a 7583, could it be a typo on the collets perhaps?
Just finished photographing these items and they seem in good order save for one which appears to have had weld placed around the inner diameter and then been machined, perhaps for an odd size?
Considering that we tend to specialise in woodworking tools it has been a bit of a 'metal week' for us, YORK lathe, these collets, yesterday a ROLLO ELF lathe and a lovely cast iron leather strap splitting machine, so lots of fun getting it all back together.
I was unable to follow up earlier as we are getting ready for another buying expedition to France tomorrow.
Best Regards and thanks for your efforts.
Martin