Dating
From the attached article:
"The results indicate that, contrary to current opinion, there is no undeniable proof that the English-lock was manufactured prior to 1650. My findings suggest that the early seventeenth-century date for this lock type has been based on questionable historical data and unrecognized lock conversions."
English Lock or DogLock?
Most interesting, as this 157-page research thesis (as attached) presents evidence that the use of the term 'doglock' is argueably one of the most misued terms in firearms chronology.
"Another modern term, 'dog-lock’, has been especially confusing in its application to technologically distinct mechanisms. The dog-lock has been described as every lock with a back-catch (Gooding: 117), an English-lock with a back-catch (Faulkner:65) , and a specific type of lock characterized by an internal horizontal sear and no buffer for the cock (Eaves 1970:296). "It is ultimately up to the arms historian . . . to provide a reliable and comprehensive thesaurus of gun terms from which everyone who has to deal with gun parts may benefit. . ." (Puype: 7). Until this is accomplished, it will be necessary for each researcher to provide a glossary clearly defining not only the elements comprising the gunlocks but what he means by the types of gun discusses."
It further states that
all doglocks are in fact just variations of the English Lock, being of 3 types below. Based on what Rudyard suggests above ... I would state that
the OP's new fire lock is a Type 2 'English Lock'. However, does it in fact have a horizontal sear (for full cock) that projects
through the lockplate? It must have one (otherwise it is a
new Type 4, haha) but with the cock down as shown, I can't see any slot in the lockplate for the tip of the sear ...
English Locks
Type 1 - Horizontal Sear through the lockplate - No 1/2-cock notch on tumbler - Has a dog catch
View attachment 303463
Type 2 - Horizontal Sear through the lockplate - 1/2-cock notch on tumbler - Has a dog catch
View attachment 303464
Type 3 - Horizontal Sear, not but through the lockplate - 1/2-cock
and full cock notch on tumbler - Has a dog catch
View attachment 303465