There is not a set of physical characteristics which definitively identify a U.S. Test Eagle. The only "tangible evidence" authenticating Test Eagle is the serial numbers of the pistols acquired at auction by Frances Bannerman, plus a handful of pistols recorded in official documents discovered by Clark Rickman. These constitute the sum total of the knowledge of a serial number range.
If by "known range" you mean the arbitrarily designated 6100-7100 set, the Bannerman numbers record one pistol beyond that range (sn 7147), and no numbers earlier than sn 6167.
--Dwight
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