I used to have a full set of melodic/concert toms circa '77, but sold the 6, 8, 10 & 12 (still have the 13, 14, 15, 16).
The riveted trim looks to be circa '81 or later but the lugs don't look Ludwig to me. They should be either the classic or mini classic lug and should have the three verticle grooves in them. I attached some catalog images for you to review.
[LIST]
[*]The first image is from the '84 catalog and shows good detail in the lugs and the riveted trim.
[*]Second image is from an '81 catalog to show a set configuration.
[*]Thrid image is from the '80 catalog to show a set configuration before the trim was added to the bottom bearing edge.
[*]The fourth image is from the '81 catalog when it looks like the riveted trim debuted.
[/LIST]