Like a lot of you my first muzzle loader was a TC Hawken, back in '76. And although it's era is past my persona's for some reason I still am drawn to Hawkens, I don't know why. Anyway, in reviewing primary documentation here is what I found relating to Hawkens first being in the mountains:
1832
From Robert Campbell's account,
5 Rifle Guns
5 Rifle Guns of men
1 Rifle
pd Hawkins for Pistols
1pr pistols & Holsters
1pr Holsters
So two Hawken pistols with holsters for Robert Campbell. Unlikely they were percussion in my opinion.
1836 is the first documentation of Hawken rifles being brought to Rendezvous
Invoice of Sundry Merchandise from the Rocky Mountain Outfit 1836 under charge of Fontenelle, Fitzpatrick, & Co.
2 dz Gun locks
1/2" Rifle "
4 pairs Pistols Iron
2 Am Rifle
7 "
8 Hawkin "
84 N. W. Guns
30 N. W. Guns
2 Rifles Hawkin
1/2 dz Gun & Rifle locks
2 Rifles Hawkens
10 Boxes Percussion Caps [first mention that I've found]
To me that means someone brought a Hawken rifle to Rendezvous in 1835. Certainly it was a percussion gun. Probably the first cap lock the mountain men had seen. And twelve mountain men wanted one. So in '36 twelve Hawkens came with the rest of the firearms.
1837 more were brought to Rendezvous.
Invoice of Sundry Merchandise furnished Rocky Mountain Outfit 1837 under charge of Fontenelle, Fitzpatrick & Co.
2m Gun Flints
3m Rifle Flints
36 N. W. Guns best quality [$4.50 ea]
5 Am. Rifles steel mounted [$19 ea]
10 Hawkens Rifles [$24 ea]
12 N W Guns [$4.50 ea]
I've always wondered why having a Hawken was such a big deal. It's not an overly good looking rifle (don't kill or scalp the messenger) especially compared to Kentucky/Pennsylvania Long Rifles. Certainly not enough to warrant its high price. Same with firepower. Nothing extraordinary there. Nor accuracy over a Long Rifle. And yet like so many of you for some reason I'm still drawn to them- and will own it when the right one comes along.
I think Hawken became highly desired because it was probably the first cap lock to the mountains, and because Hawken was [I think] the largest gun maker in St Louis so could produce the largest number of cap locks. The name Hawken became synonymous for "cap lock" or "percussion gun" in St Louis. Like Xerox for copiers. And after seeing the speed of loading and the all weather reliability of a percussion gun who wouldn't want one if they could afford it.
Anyway, that's what I've learned and my best guesses. If any of you can add to this please do so.
Was a flintlock Hawken plains rifle ever built? Maybe. Did one ever go to the mountains? The only way we will ever know for sure is if one shows up with documentation showing it did. Certainly a possibility.