MB compatible Locking Nut for vintage 144 and 146 seals
Used on an MB type piston to secure the cork seal in place.
Suitable for vintage pens including 144 , 146, 149 and all 13X and 14X versions
This piston nut will also fit the 142,144 vintage pens, as well as the 132,134,136,138 and 139 vintage pens
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