Who can identify (and give detailed info on) this vintage Swan fountain pen, a piston filler; the barrel is marked with a Swan logo and the text "Swan Reg. Trademark" and with an "F" (denoting a F-nib). The cap is a bit "Lustraloy-like", has no text, and the clip has a swan logo. It has similarities with a Parker 51, but is is smaller, see pictures. The squares on the last picture are 10x10 mm. Any help would be appreciated!
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