It looks like a date but it's actually a serial number for the printing plate that was used to produce that particular bill.
All bills have them. Due to changes in the printing process plate serial numbers on modern bills are usually no more than two digits.
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A 1934 five dollar silver certificate in good condition is worth $33.00.
Please check your bill again. There were no series letters on 1934 silver certificates, and no silver certificate series letters ever went as high as K. Please see the question "What is the value of a 1934 US 1 dollar silver certificate?" for more information.
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The blue seal indicates your bill is a silver certificate. Please see the question "What is the value of a 1934 A US 5 dollar silver certificate?" for more information.
The blue seal indicates your bill is a silver certificate. Please see the question "What is the value of a 1934 B US 5 dollar silver certificate?" for more information.