Let me start by sayin' that ever since the resurgence of the Swayback Jack with the Bose/Case collaboration release a while back, I've always wanted one, never even heard of the pattern till recently.
Recently I won a Case Chestnut Bone CV Swayback Jack in a giveaway from Brutus013 a forum member here at BFC.
I was excited to be gettin' a new knife, especially one I've been lusting over, (maybe lusting's to strong a word, more like, wanted really bad) anyway to make a longer story short, the knife arrived in the mail and I rushed to open the envelope and examine my new knife.
It was pocket worn

with a deep natural patina and shavin' sharp, I was ecstatic, I went over every inch and was very pleased with the F&F, (heck it was a free knife, I'm not gonna complain) considerin' all the bad press Case has gotten over the years, I won't even consider buyin' a Case knife unless I can examine it first, this one was a gooder in my book.
As I wrapped my fingers around it it felt right...familiar, that one thought drove me crazy for two days, familiar, why did it feel so dang familiar, I've never held a Swayback Jack that I recall, yet this pattern has been in my hands many times before, it was the most intense feelin' of Deja Vu I've ever experienced.
The familiarity of this knife was hauntin' me and I couldn't figure out why, why in the dark my fingers knew the curves of the handle, it just felt right.
Then the other day as I was roundin' up the various EDC knives left around the house`durin' their use all week long, I found this little puppy, which had been in my pocket just about a month ago, (how quick I forget) my little 20+ year old Frost Cutlery Black Hawk II, I had bought this knife when I first move to PA in the mid 80s.
This little knife was a constant companion and found it's way into my pocket most mornings I went to work. This knife always felt right in my hand also, the ergonomics are evident the moment ya grasp the knife, that's when it dawned on me why the Case Swayback Jack felt so familiar, I'd held it in my hand many times before in the incarnation of that lil' ol' Frost Knife.