"BV" with crown above
"BP" with crown above
"NP" with crown above
"nitro proof"
number "12" and a small "c" beneath, both inside a diamond
"2 1/2 "
"1 1/8 oz"
The above are all exactly alike on both barrels, and in addition;

Right barrel - no choke marking (and it does mic accordingly)
- a fraction with a "13" over a "1"
Left barrel - an additional number "12" by itself(no diamond)
- "choke" (and does mic accordingly)
- very small symbol of crossed swords with a
letter "s" beneath.

And finally the rib is marked "A LANCASTER" in all caps.