23 7 VD 31 Without seeing the numbers or the head number or the complete mower it can be a lot more difficult to decipher as the number can be 23 with a 7 on it's side then a 1 then a haft stamped 0 then 31.
You may have the correct stamping or it could be a re conditioners stamping but I have seen too many mis-stamped numbers.
