Any conversation about the ‘two reverses’ on the curule aedile issue of 58 BCE (CRRO 422/1a; see previous post), needs to also consider the design experimentation at the end of the same decade with ‘two obverse’ types. For instance,
and CRRO 437/1a
And of course 434/2 is also a double reverse of sorts.
[All images link to acsearch.info entries.]
Liv Mariah Yarrow 
And, of course, the issues of the (in)famous L. Appuleius Saturninus of c. 104 BC (a full generation earlier), Cr. 317/1, 2 and 3 (Roma/Roma, Roma/Saturn in quadriga and Saturn in quadriga/Saturn in quadriga.
Yes! Thanks!