Vintage Esterbrook "8 Ball" Model No. 113 Chain Fountain Pen Desk Set - Rare!

Description

This is a really nice vintage Esterbrook No. 113 fountain pen desk set with a chain - made to use in a bank or other public place.  It is in like-new, excellent condition and may never have been inked.  The black ball shines like new and is free of scratches, dings, etc. The chrome ring around the well is like new.
The original peel-off label on the bottom is intact and legible.
The chain is 24" long.
The pen has a new sac and the fill lever works well.  The body of the pen has a few very small imperfections. The "Esterbrook Made in U.S.A." embossed trademark is clean and unworn.
The pen has a 9128 steel nib, which was classified by Esterbrook as "flexible extra fine". If you don't like it, you can swap it out for any other Esterbrook "Redi-Point" nib.
This would be a great addition to a collection, or would be a really nice everyday desk pen.
Please see the photos for best description.  Questions welcome!