"Ideal" Pyatak
Alas, Numismatics isn't always a precise science, and though, documents are great when they are available and correct, one must also theorize and base the assumptions on analysis. Below, is my humble opinion on what the "ideal" 5 kopecks in series of Elizaveth (Elisavita Petrovna) coins is.
Trial 1757 coins (5 k.) with different coat of arms (Petersburg, Moscow and Siberia) - beautiful myth and nothing more. Analysis of those coins lets us identify coins of a later times, particularly if you would pay attention to their scrolls.
The model five kopecks 1757, with silver