Vintage Parker Duofold Junior Mandarin Yellow Lucky Curve Fountain Pen 4-26.
George S Parker of USA produced in last quarter of 1926 for sale in 1927.
Twin gold plated rings and the gold plated 5-16 Pat Sep Clip.

The pen is working well and has been recently serviced by a Parker specialist. 
An attractive addition to most pen collections.

Any questions please ask.