Imperial US Prov. Single Blade Folding Pocket Knife, Known as Jiffy Jack-master, Mystery, or Trick Knife.
* Blade facing up - push on blade to open knife
* Blade facing down - push to close knife
Measurements - 1 3/4" blade (long), 3/8" tall * Also a Bottle Cap Opener on Blade *
Handle - 3 1/8" x 1/2" Faux Mother of Pearl
Imperial called them the "New Jiffy-Jackmaster" and refered to them as a "low priced yet thoroughly practical automatic knife" in their 1936 catalog. In the 1937-38 catalog they were given a MSRP of .25-.29 cents. In the 1952 catalog, they were subtitled "Mystery Knife" and included ad copy ...
"Frequently refered to as a "mystery" or "trick" knife, the "JIFFY JACK-MASTER" has strong appeal as a gift item, souvenir, a premium, or as an advertising give away". The tang marking on this knife was used primarily from the mid-1950's through the early-mid-1980's. It was listed in the 1962-65 and later Imperial Giftmaster catalogs as the "AL-8 Mystery Knife".