what condition is the rifle in.
Under the floor below the brake pedal.
Peter G. Sheridan was born in 1950.
Guillermo Sheridan was born on 1950-08-27.
These sell for about $2 in online auctions.
About $2 for silver scrap regardless of the condition.
They have a silver melt value of a round $5.
There was no US silver dollar minted in 1950. If you mean a half dollar, it would be worth at least its value in silver which as of writing is about $7.70 but it would be worth more in better condition. As with all old coins, cleaning harms the value.
The value is for the silver only, about $3.00 the coin is very common.
The C and CB series (NOT the C9 Series) in fair condition is worth around $55 to $85. There are many versions of the C series Sheridan Let me explain: Sheridan made air rifles started in 1945 and made a few variations of the C series. Benjamin bought out Sheridan and continued to make the C series ( C9, CB, CBW CW ) From 1949 to 1990 it was marked Sheridan. In 1972 serial numbers were redone and started with #000000. Crosman bought out Benjamin (1992) and continued to make the C series Rifle (It's very popular) The rifle was made in .177, .20, .22 caliber. From 1998-2000 Crosman marketed the C series .177 and .22 Caliber as a Benjamin and the .20 Caliber as a Sheridan. You may see a C9 Silver Streak or a C9 Blue streak. They are the current C series rifles At one point during the 1950's the rifle was marketed as a Benjamin Franklin as a marketing ploy. Benjamin Franklin had nothing to do with it. But his name got stuck on it anyway. Along the way the rifle has also been marketed as a Benjamin / Sheridan.
The 1950 Half Crown of Georgius VI is not made of silver, but of cupro-nickel. 50% silver Hlaf Crowns were issued until 1946. Source: Wikipedia
No US silver dollars were minted after 1935. Please check your coin and post a new question.
The US didn't print any silver certificates dated 1950, only Federal Reserve Notes. Please see the related questions for answers related to FRN's