Those round shields, did they stop making them in the 90s or something?
Well those round shileds are basiclly a part that used as a radar dish in Space set in colors like clear and clear red. In 1984 when TLC launched the Castle line they made this as a shiled in dark gray in most of those set that year 6010, 6021, 6022, 6030 and 6061 (6103 the Candian version as well). The only other sets afterward that included that set wwas 1680/1877 (from 1990) and this set 6039 from 1988.
Now for my review
Bought that set as a kid cause I wanted the barding, the berrel which was new of course, first set to include small cart wheels, was pretty disappointed back then and for a while regreted ever buying it. As a catapult it not as good as 6030. I'm not a big fan of the design but as a small set it's pretty ok.
Final score 8/10