Could be he was referring to internal brass stamping or pencil/ink marks which are common on French lenses!
The dimensions he gives are brass sleeve measurements, so Jim's glass measurements of 6cm are better to use in calculating F value.
There is a touch of balsam breakdown, which is typical of the age of this lens.
My comments about it being a fast CdV Petzval (perhaps just under F3) still stand.

This is a very odd lister, who uses both a Czech and a Slovakian address. Nothing wrong with whats he lists in general, although the more perfect classy items are pushed up in price (like so many others at the moment). Talking about actual listings can be a bit suicidal as others may get interested!