all 2687 watches I find online seem to have a mix of hour markers and numerals. I haven't found another like this, which only has markers and no numerals. However, the drawing on the Omega website, for 2687, shows this exact same design.
For the record, the web link and document download work ok on Safari in the UK, so perhaps use a different browser or adjust your settings?
If you want to get into tresors its certainly worth reading the whole document.