you would do better just supplying a detailed photo, than the rewritten marking, as the the "K52G" is likely just "K52" (BAV199 diode) ang G is some other indentifier.
The board look awful lot like an oscilloscope input buffer, so a BAV199 seems legit in that obligatory circuit, also in the place near "3EM" (MMBTH10).
Not sure what 6683 may be from a brief search. Send please just a detailed photo. Experienced eye may guess even the manufacturer of the IC, based on the package and marking font style.