Lamy has tipping...was at the Factory. Is on my CPM-1, Safari, Persona OB (more obvious being a 18 K gold nail nib)...made into a CI due to it being a nail, and having no line variation. Sold my 27, it too had tipping, an OM.
I imagine Jo Wo also is tipped, in it has to fight Bock. Can't see Twisbi going from a tipped Bock to an untipped Jo Wo.
The Esterbrook 1xxx, 2xxx didn't have 'Iridium' tipping, so would only last 1 1/2 or so years of constant use....no problem today in no one is going to be writing with it 8 hours a day, 5 days a week. 'Iridium' tipping was the 3xxx&9xxx, which cost more but was expected to last 7-10 years of constant use in the One Man, One Pen days.