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Others that know more than me will chime in soon but I think one number is the serial number, the other the "order number". Stub twist bbls are very unique in what they were made of. Parker bbls are not particularly interchangeable generally, as every gun was fit by hand and it's rare that a bbl set will fit on another gun without some fitting. Stand by and don't go away; others will offer more info than I have.
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