[urbanspaceman]

Colichemardes account for as little as 0·3% of all smallswords extant.
Curiously, Greenwich Maritime Museum has the greatest proportion with 6 out of 120 smallswords having colichemarde blades.
As my inestimable colleague proclaimed: they were generally restricted to officer classes who might actually have to use them, and consequently favoured the reinforced forté. Civilian wearers preferred the aesthetically superior, standard un-shouldered blade, as they probably never had to use it.
Jim also agrees with me in that they were falling out of fashion during the second half of the 18thC.
I have a William Kinman silver, boat-shell hilted example with a 33" (84cm) blade (which was unusually long), and while the hilt is in perfect condition, the blade looks a good 100 years older. Kinman was marking from 1765 to 1799, so again, as in Fernando's example, I suspect it was a re-hilt (see image).
I will take this opportunity to reinforce what I have hinted at before, and that is: colichemardes feature a constant width groove/hollow on their lower face. This is a product of the second notorious machine: invented by Huguenots in Solingen around about 1625/30 that used a roller to fashion the groove from above while the stock was forced into the standard anvil die, and was brought to Shotley Bridge in 1687 by the two Mohll brothers. They had been trying to get it over here for some time as it was not well favoured in Solingen.
Given an opportunity, you will see that a lot of colichemardes feature a curvature that is a product of too much pressure from the roller; it would not have been present initially but generally would have developed over the years.
There are a lot of munitions grade smallswords that also feature this groove as it was far quicker and cheaper to produce; although this second image is of a special order smallsword made for a naval officer during George 3rd's reign by Thomas Gill of Birmingham that was obviously an expensive and unique commission; again, it features a Boulton hilt.
By this time the Mohlls/Molls/Moles were working down in Birmingham and using their rolling and grinding machines; but not, I hasten to add, under their own name.
To that end I would be grateful if anyone else has observed a late 18thC trefoil smallsword blade coming from Birmingham's makers.