On March 26, 2007, I spent the day at S&N Labs, where Dr. Neil
Spingarn ran SEM-EDX tests on 25 more
1854 and 1855 pattern Flying
Eagle cents.  The results are interesting and consistent with the
results of my first submission in that there seems to be a wider range
of metallic varieties for the bronze 1855s.

MY OFFER TO OWNERS OF 1854 & 1855 LARGE FLYING EAGLE
PATTERNS


As well, though both the J-170a and J-171a are described in the 9th
edition of the Judd book as R8 (2-3 known), test results confirm
neither is rarer than R7, and it is more likely each is an R6.  Please
make sure you do not pay a premium for an untested J-170a or 171a,
or at the very least be cognizant of their true rarity.  Although the
researchers of the Judd book are the best in the field, this is the first
time this large volume of
1854 and 1855 pattern Flying Eagle cents
has been tested.

It is truly impossible to determine a pattern's metallic composition,
and consequently, its Judd number, by visual appearance alone.  Even
the experts can't tell.  In my first group of coins that S&N tested in
2005, three of the four coins slabbed as J-167 (copper) tested out as
J-168 (bronze).  Of the 45 LFEs submitted in slabs, 40% (18) had been
misattributed, and consequently, changed Judd numbers.Do not be
fooled by a representation by a dealer or the print on a slab.    
SEM-EDX testing is necessary.

I hope to test ten to fifteen more LFEs in early-2008.  More info to
come.  Rick
1854-1855 Pattern Flying Eagle Cent Research
Rick Kay Rare Coins/Patterncoins.com