Could someone give me a list of the differences between the IS-3 and IS-3M?
i have the one from Trumpeter IS-3m
search for scalemates ,then look to both in review and find out by yourself 
Specifically, were the side toolboxes reversed on the IS-3M (hinged side on top, as opposed to the hinged side on bottom)?
All the present day online references I have seen show the toolboxes with the hinged side on top. They say the tanks photographed are plain IS-3s, but I’m not sure if they are correct, or if the tanks are actually IS-3Ms.