Just to confirm James' post above, the long scear spring was used in English locks until roughly 1765, then replaced by the shorter style.
This is just a generalization, as there was no immediate change over.
Having said that, the faceted pan is not seen usually on English locks and I still think the lock in question has a Germanic look to it, But, Germanic locks often had the pan screwed to the plate & a screw showed on the lock face between the breast of the cock and the pan.
We see no evidence of this on the lock in question.
Such screws can be seen above in poste 5 & 11.
Best regards,
Richard.
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