J #604 builders plate

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Greetings from Dry Branch,
         Would anyone have any ideas on how I can authenticate a "J" 
builders plate I came across a couple weeks ago?  I would have thought all 
14 numbers had been accounted for by now but this does seem to be the real 
deal. It's from the 604 and the only history I have is that it came from 
Bluefield. I've noticed that pictures dating from after the wreck on 
6/12/46 show no builders plates and wonder if they could have been left off 
after the repair. I know it's going to be difficult to piece together the 
history but I'd like to try. Any suggestions or info will be greatly 
appreciated.

Chuck Speicher