Hi Darrell,
I agree with David and Phil, the plating would obscure the solder at the base of the lugs, so that is not a concern.
Here are photos of mine, it's up in a frame now so I can't easily get a sige view shot of the lugs. But I do have an older photo showing the back. Note it is not completely plated on the back. I have also seen another one similar to this in recent years. The plating does go up the lugs though.
My concern about your badge is that it does not appear to be as crisp and sharp in detail as mine (lettering in the annulus particularly)? Which would be one indication of a cast copy... Does the plating on this badge appear worn? Perhaps the plating was done after the badge had been worn for some time. I am not aware of any copies of this badge that have the word 'TANK' show through to the back. Not sure what to think.
