Definitely not my “first” knife, as I know I acquired a few old Pakistani Buck-style lockback knockoffs and not actually Swiss SAK-style knives beforehand, but I do remember my first knife purchase.
I was probably 11 or thereabouts, and my parents and I were visiting St. Augustine, Florida in winter. We trapsed into a touristy shop filled with historical and/or pseudo-historically themed edged weapons. There, I selected a super cheap German youth type knife, with a molded plastic handle adorned with a diamond shaped badge (bearing some nondescript, but not actually nationalist) emblem. I’m sure the steel was “Rostafrei” or similar, and if I recall correctly, there were ineffective saw teeth on the spine and a bottle opener cutout in the ricasso. I proudly toted that horrible thing concealed in my inside jacket pocket for the rest of the trip.
It later met its doom getting thrown at a tree in the yard, when the handle busted in a bunch of pieces, exposing the whole inch of hidden blade tang. Quality!