Du Pont Garden Hose Sprayer

I found this Du Pont Garden Hose sprayer in my attic.Must have been from my Husbands grandfather and we have been in this house 10 years.We are trying to find out if it is actually worth anything.It is in almost perfect condition maybe never used with an extra hose and papers still inside.It is a Du Pont Garden Hose Sprayer,Disributed by E.I.Du Pont De Nemours & Company Inc.Grasselli Chemicals Department Wilmington,Delaware, a standard quart mason jar.
On the bottom of the instruction paper that was inside the bottle in exellent condition it say's 1957 Sprayers & Nozzles,printed in U.S.A.
There is also a GUARANTEE paper on the inside in exellent condition with an address of...Sprayer Repair Dept. 2575-28th ave. North St.Petersburg 13, Florida,Must have been a long time ago before we had zip codes here.
Tryed to email Du Pont but never recieved a reply.If you could tell me any information on this piece would be greatly appriciated.Came to you because me and my husband watch your show faithfully EVERY week.
Thank you for your time,and hope to get a response !!
Rebekah Kolb