Re: Chassis coatings (generally and specific sets)
Yes, I have seen that construction before. I think those tags are pre prepared before the set is actually constructed. Thet are pre tinned, and the coating may be ground/abraded away before soldering.
Steel will solder very well by itself if its cleaned and a decent flux used. For steel its generally "killed sprits" or Bakers fluid which is a comercially available product. In either case it is hydrochloric acid into which has been added enough zinc metal until the solution is saturated, i.e. when the reaction no longer occurs. After soldering or tinning the tags, the chassis/escutcheon is then washed to neutralize the flux as it remains fairly corrosive, especially in an electronics chassis.
This is just my experience in chassis/escutcheon preparation.
Joe
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