The picture shows two views of this Old Cast Bronze Swedish Designer Cannon Jewelry Cuff Link Set. This cufflink set is not dated but it is believed to be from the 1960s or 1970s. They are believed to be by Swedish Modernist Designer Inger Robbert. The top sections of these each have an old military cannon. They are each marked on the back as follows:
ROBBERT TROSA
To judge the sizes the top section measures 1-3/16'' x 5/8'' x 1/8''. The set appears to be in mint condition as pictured.