The X signifies that it is a duplicate serial numberr
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All model 67's and 67A's have no serial numbers
This firearm has benn overhauled at the Winchester factory and a different receiver installed. James Friend
http://armscollectors.com/sn/winlookup.php?file=win1873.dat
It looks like an L, but, it is a one.
if the serial number is below 579600 it is considered a pre'64