Another Henry, unfortunately without an image of the proof marks
https://www.gunsinternational.com/g...rds-hammer-12-gauge.cfm?gun_id=101877098

From the IGC - 5 Henry Richards
39 Fish Street Hill & 125 Strand, London c. 1808-9
Newbury c. 1850
11 Aston St, B'ham c. 1851
Liverpool 1858-70
Cincinnati c. 1880

I think Raimey is correct that the 'V' has a crown so the gun is pre-1877

Can't find a MGBte either frown
https://www.hlebooks.com/daubres/li01.htm

bte stands for "boîte," (box)," indicating a mailbox or parcel locker

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