This is obviously worth money buy I need the model number in order to answer you. Benjamin made several different models that were .22 Cal
The value of a benjamin sheridan 392pa 5.5mm 22cal air rifle is $185
In 1977 The Benjamin Rifle company purchased Sheridan air gun company. In 1992 Crosman purchased Benjamin. So now Crosman owns both Benjamin and Sheridan.
If unfired,the rifle is valued at 895 dollars in the condition that you describe.
Here is the link to all of the manuals for Sheridan and Benjamin. Crosman owns Sheridan and Benjamin See the link below.
If your winchester centennial rifle is unfired(new in the box) with the box and tags,its value is 675 dollars.
If your Winchester model 1894 NRA Centennial rifle is unfired(new in the box condition) then the value will be 695.00 dollars.
The Benjamin or Sheridan pump rifle should never be pumped more than 8 times. See the link below for the owners manual (Crosman owns Benjamin and Sheridan air rifles)
Your Canadian centennial rifle or carbine in unfired condition will bring 650 dollars.If the rifle has been fired,then you are looking at between 200-350 dollars.
Crosman owns both Sheridan and Benjamin. They have most of the manuals online. see the link below
Sheridan was very haphazard about numbering and naming there models. In 1977 Benjamin bought the Sheridan line of air guns later Crosman bought both Benjamin and Sheridan. Some models actually say Benjamin Sheridan on the rifle. Sheridan who had been around since 1945 finally started numbering their rifles in 1972.
Crosman owns Sheridan and Benjamin air rifles. They offer a ring base for the Sheridan it's part # B272 and clamps right on the barrel of Sheridan and Benjamin rifles and pistols. You can order them through Crosman, Airgunsofarizona or Pyramydair. They cost about $14.00
If your rifle is unfired(new in the box) along with the original box and tags it will be worth 650 dollars in todays market.