Bill and David, many thanks for your help and comprehensive info (especially as the ask was a bit off topic!) I think I will go for the historic seniority which is the approach I've taken with the British Army ones.
I guess the Lincoln connection will remain a mystery and the 91st too. From my research Delandre seemed more concerned with making a quick franc than spending time on accuracy or original designs - there's one design with a blank tablet that was then used to depict 12 different British units. Economy of effort for max return!
Really appreciate your guidance on this, thank you.
Michael
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