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This is a 1946 Parker 51 RED BAND button-fill in Black with Brushed Lustraloy (stainless steel) cap. Very rare filler mechanism, made only in 1946-7! Shown open so you can see the button. This is the later version, with aluminum blind cap threads (the earlier version has plastic threads). Parker had a problem with the 51 collectors flooding – this system was supposed to solve that issue. The system was so difficult to repair Parker soon …