Twist mechanism converters for Pilot fountain pen. This is a replacement model for CON-50
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Got this to replace the stock Aerometric converter that came with my Pilot MR. It's nice to be able to see how much ink is left in the pen. Purchased another unit for my second Pilot MR
It is a fine converter, but it is hampered by its small size. If you don't usually have an ink bottle close by, you might be better off using cartridges.