To clear things up:
> As you can tell from the coins and bills in your pocket, the motto is In God WE Trust rather than "you"
> The motto wasn't added to bills until 1957 so your bill doesn't have an error.
Please see the Related Question for more information.
It is impossible to answer without knowing the condition and the denomination.
a mint condition silver certificate is worth $5-$6.
An 1899 silver certificate is worth around $40 if in good condition. It can as high as $250 if perfect condition.
Check that bill again. There was no $1 silver certificate dated 1931.
This is not a rare date for silver certificates. As of 9-5-2011 it is worth $1.25 to $1.50 in circulated condition. In uncirculated condition it is worth $3 or more. This silver certificate should have a blue seal.
It isn't an error, In God We Trust wasn't added to US bills until the 1950s or so. That being said, 1935 silver certificates are worth more than their face value, but the fact that it doesn't say In God We Trust doesn't make it worth more than another 1935 G certificate in the same condition.
The value of a 1934 US silver certificate without "In God We Trust" can vary depending on factors such as condition, rarity, and demand from collectors. Generally, these notes are worth more than a standard 1934 silver certificate with "In God We Trust," but specific valuations would require further examination and research.
How much is a 1957a silver certificate worth?
It is impossible to answer without knowing the condition and the denomination.
All 1935-E Silver Certificates were printed without the words "IN GOD WE TRUST" ... this was not added until Series 1935-G. In circulated condition, it's worth about $2.00 A nice crisp uncirculated one is worth about $5.00
Less than 11% of all the 1957 series Silver Certificates have the star by the serial no. If your Silver Certificate is in choice crisp condition it is worth $40.00. In circulated condition, it's worth about $5.00
a mint condition silver certificate is worth $5-$6.
An 1899 silver certificate is worth around $40 if in good condition. It can as high as $250 if perfect condition.
As you can tell from looking at any modern coin or bill, the motto is In God We Trust, so I updated your question accordingly. That motto was added to bills starting in the late 1950s so your bill is not an error, it's just too early to have the motto. Regardless of the series letter, a circulated 1953 $5 silver certificate is worth (at retail) face value to $8 depending on its condition.
Check that bill again. There was no $1 silver certificate dated 1931.
All Series 1935-E Silver Certificates were printed without the IN GOD WE TRUST on the back -- this is normal for those notes. This motto was not added until 1935-G In circulated condition, it's worth about $2.00 A nice Crisp Uncirculated one is worth about $5.00
The U.S. hasn't printed silver certificates since the 1960s, and there was never a $2 silver certificate.