Montblanc 149 + 146 Piston Seals

These piston seals will fit recent pens by sliding them onto the piston shaft, although ultrasonic cleaning of the original parts and a little heat and patience are required to get things apart and intact.

Available with or without a rubber O-ring at the top.
Note: The seals without the o-ring have dimensions of 9.1-9.15 mm at the largest diameter.  These can be too small for some year's models, so please measure the seal you're intending to replace to make sure this replacement will work for your pen.
Seals with the o-ring are 9.5 mm at the largest diameter. (seal with o-ring is currently out of stock).