Thank you, from the responses here, it seems to be true, that although there are examples of exceptions, the general rule was that Officers did not often choose to have their decorations mounted on the early trapezoidal-style bars so that the gongs were detachable and the bar could be worn as a ribbon bar. Even though there are some fine examples above in this thread, the majority of officers seem to have had their medals permanently mounted on the bars, even trapezoidal-style bars. IF they were detachable, the bars sans medals, were not often worn by officers as ribbon bars with the appropriate order of uniform.