All About Pocket Knives

My father recently found a knife that he had gotten from his Great grand mother, and i am trying to find out everything i can about it. It is an automatic, double-bladed knife with the words "Office Knife" carved into one of the ivory handle inlays.
I am mainly wondering how to determine which year this individual knife was made, and the value, but would appreciate anything that i can find out about it.

If it is a Schrade Cut Co stamp, and I suspect it is, it was made from about 1904 to about 1946.
In better condition I believe it would easily bring $250 to $300. Condition is the key here and yours is somewhat used and has cracked handles. I am assuming that the mechanics are operable. Assuming it flips open and locks tight and that the safety is working. It is a tough call but I am going to guess it should do from $65 to $95.
My best guess...

Ray

Schrade also made that pattern for Remington in the 20's and 30's. Even though the scales are cracked, the blades look fairly full and assuming a good spring that knife should easily be worth $100. Don't try to sell it on Ebay though, its illegal and the auction will be cancelled.

Price/Zalesky's "Collectors Knives" 15th ed. lists a number of office knives in the Schrade section. There are two listed with "Cream Pyralin handles" and two more listed with "Ivory Celluloid" handles. Are there any numbers stamped on the tang? If so, that would help in identifying more information about your knife.

The only stamping on the tang is as follows:
Smaller blade tang:
US Patents
Dec 21 09
Sept 13 10
June 6 16

Large blade tang:
Schrade
cut. co.
Walden, NY

Both blades snap into place easily and forcefully, and both safety locks function properly