Carpet and metal grill on an Ampeg 4x8? I don't think that would be original. They did carpet and metal grills on some cabs for a while, but I don't think they made a 4x8 that way. It may have been recovered at one point. As far as when it was made, there should be a serial number on there somewhere which you can decode using this:
The modern Ampegs of the St. Louis Music era were all made after 1985. The amps made since 1988 have a 10-digit serial number which is encoded for model, country, date, and year. The serial number can be broken down as follows:
Digits 1, 2, 3 = Model
Digit 4 = Country Code where:
U = U.K.
D = domestic U.S.
W = worldwide
Y = Europe
Digit 5 = Year where:
A = 1988
B = 1989
C = 1990, etc.
Digit 6 = Month where:
1 through 9 = January through September
0 = October
A = November
B = December
Digits 7, 8, 9, 10 = serial number
More info here if you need it:
http://www.ampegv4.com/dating.php http://www.unofficialampeg.com/