notice u/s 148

149. (1) No notice under section 148 shall be issued for the relevant assessment year,—

(a) if four years have elapsed from the end of the relevant assessment year, unless the case falls under clause (b) or clause (c)1 ;

(b) if four years, but not more than six years, have elapsed from the end of the relevant assessment year unless the income chargeable to tax which has escaped assessment amounts to or is likely to amount to one lakh rupees or more for that year.

(c) if four years, but not more than sixteen years, have elapsed from the end of the relevant assessment year unless the income in relation to any asset (including financial interest in any entity) located outside India, chargeable to tax, has escaped assessment.

As per the sub-section (b).... you received the notice on last date....... & as per sub-section (c) it is 16 years from the relevant AY. Hence, it is VALID.