Notwithstanding the provisions of any general or special law, rule or regulation to the contrary, the Norfolk County Retirement Board is hereby authorized and directed to credit Richard Martini with creditable service, for the period of July, nineteen hundred and ninety- five through June, two thousand, inclusive for the purpose of determining his superannuation retirement allowance pursuant to the provisions of paragraph (a) of subdivision (2) of section five of chapter thirty-two of the General Laws; provided however, that before the date of any retirement allowance becomes effective in the case of Richard Martini, said Richard Martini shall pay into the annuity savings fund of said retirement system of said city in one sum or installments, upon such terms and conditions as said board may prescribe, an annual amount equal to that which would have been withheld as regular deductions from his regular compensation for such previous service, plus interest.