What is the information that is on the paper stickers...that will help identify the chips.
Also, above the code that you posted is a five-digit date code, which ends in either a letter or digit. If you will post both of those bits of info, maybe we can identify the chips used.
The other clue, if it is Winbond UTT are physical markings. The chips will have the two trademark Winbond "dimples" on either side of those codes above and it will have a small hole in the lower left hand corner and on each edge (left and right) of the IC there will be two metal strips/staples visible. If you have these markings, then you are almost assured of having Winbond chips.