There were no $50 silver certificates issued in 1918. However, there were National Currency Notes issued that have a somewhat similar blue seal.
If you do have one of these you will need to have it checked by a currency expert to make sure it is not a counterfeit or reproduction because a genuine bill can be worth in excess of $7000 depending on its condition.
The bill must be a $1 silver certificate. All $2 bills issued after 1918 are either US Notes or Federal Reserve Notes, and none were dated 1935.
A 1918 US $100 bill should be a National Currency Federal Reserve Banknote; the last $100 silver certificates were dated 1891. Please see the question "What is the value of a 1918 US 100 dollar bill?" for more information.
There are no 1918 silver dollars Please see the Related Question for information about 1922 dollars.
Despite its blue seal, your bill should say "National Currency" rather than "Silver Certificate" across the top front. Seal colors weren't standardized until 1928 and many different types of bills used blue seals prior to that year. Please see the question "What is the value of a 1918 US 1 dollar bill?" for more information.
If the coin shows so much wear you can't read the date, value is only for the silver about a dollar
The bill must be a $1 silver certificate. All $2 bills issued after 1918 are either US Notes or Federal Reserve Notes, and none were dated 1935.
A 1918 US $100 bill should be a National Currency Federal Reserve Banknote; the last $100 silver certificates were dated 1891. Please see the question "What is the value of a 1918 US 100 dollar bill?" for more information.
There are no 1918 silver dollars Please see the Related Question for information about 1922 dollars.
Despite its blue seal, your bill should say "National Currency" rather than "Silver Certificate" across the top front. Seal colors weren't standardized until 1928 and many different types of bills used blue seals prior to that year. Please see the question "What is the value of a 1918 US 1 dollar bill?" for more information.
If the coin shows so much wear you can't read the date, value is only for the silver about a dollar
36.491.942 coins were struck in 1918. Value : about 1 dollar.
3d
No such coin exists. From 1905-1920 there was no dollar coin minted.
Please check your bill again and post a new, separate question. The US didn't print any $5 silver certificates dated 1920. The nearest dates are 1918 and 1923.
Please check again and post a new question. No silver dollars were minted from 1905 to 1920 inclusive. If your coin is actually a HALF dollar (check the back for its denomination!) there's more information at the Related Question.
It's highly unlikely that your bill is genuine. All 1918 series $10,000 bills were issued as Federal Reserve Notes. They're extremely rare and generally only available to museums and high-end collectors.
Look at the coin again and post new question, no US one dollar silver coins were made in 1918.