Mills MRA two types of different brand ?


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Some vendors still have a supply of NOS, USA made Mills resistors.  Vishay bought the company, in 2011, and moved production to Mexico.
The older 12w Mills have black bodies; the newer version has a brown body.  Both sound good but I prefer the older ones.
Vishay bought Mills in 2011 and they have been making them ever since, in brown. There were four, color/finish versions of the older, made in the USA, Mills wire wounds: Dull(flat) in either black or brown / shiny and smooth in either black or brown.
@salectric 
thank you
why you prefer the older ones: how do they sound compared to newer ?