Has the original number 1 gold Swan nib

Imprint of "Swan" on feed and imprint of "SWAN M1" on section - see photos

Clear imprint on barrel and the text "SM100/86"

Ink sac and lever work, tested with water

Possible date, late thirties.

Cap has become a bit discoloured possibly due to lying in the sun too long.

Length capped 12.5 cm (4 17/18 inches)

Returns are accepted if you think the pen is not presented clearly in the photos or my description is inaccurate.