Hollow blades

[urbanspaceman]

Following up on my colichemarde question posted last week, which didn't elicit an answer, I am asking another question from the same genre:
does anyone know/can anyone declare with any certainty, when the hollow blade first appeared on a smallsword.
It is apparent that the fashion of the smallsword in Britain grew from the restoration of the monarchy when King Charles 2nd returned from exile wearing a sword with a classic smallsword hilt.
Now this is a dark and mysterious area for me, made all the more obscure due to portrait artists using stock images of weapons, because I am aware of many smallsword hilts mounted with different blades. In fact, I have recently realised, and you must remember I am very new to the field of arms and armour, that many sword types are classified by their hilts alone. Certainly, looking at many museum catalogues, it would appear to be almost universally the case.
The transition from rapier to smallsword seems to have taken place over here in Britain during the second half of the 1600s as 'Cavalier' rapiers began to become less prevalent and smallswords more so.
I learned that the trefoil/hollowed blade was invented, developed, and remained exclusive to Solingen until Shotley Bridge was born in 1687. In fact, it was precisely the Solingen exclusivity that was used as the façade to allow King James 2nd to establish that armoury to supply his 'Jacobite' militias.

I have two brass hilted smallswords made in 1687/8 in Shotley Bridge, that feature narrow broadsword blades… and there are plenty other examples: such as the "squeezed blade" style which endured for some time.
If the fashion was for hollowed blades and the associated clientele were wealthy aristocrats et al. then why were those smallsword hilts not on trefoil/hollowed blades.
I have suggested before that we Northerners (including Scotland) may well have preferred a bit of weight and some cutting ability; but remember, not all those Northerners were unsophisticated heathens with no decorum… probably (!?) and - ironically - most had London mansions.
Hence my opening question: when did hollowed blade smallswords first appear here in Britain?
Perhaps the answer is in the hilt.

[Hotspur]

Are these blades then lumped into the term 'shearing' swords?