Welcome to the forum!
The 127UH was in production twice, 1968- 1969, and again 1972- 1988.
The 125OT was introduced in 1972 and was in production until 1997. Like the 127UH, it was a single blade 5 1/4" hunter.
Plenty of overlap there, and yep, I would say that your knife is a 'mutt' but a very nice one. It has the good looks of the Uncle Henry Staglon handles and the usefullness and desiribility of the carbon steel Old Timer blade. The result of a worker at the end of a shift, ready for the weekend, or late for lunch. An honest mistake, unlike some of the last issues by Schrade where knives were put together much quicker, to fill important orders.
We can narrow the date of your knife by looking at whether or not it has the hole in the bolster for a lanyard or thong.. In all production years except 1974- 1975 there was a hole in the bolster.
Thanks for bringing your question to us. Enjoy the fine old knive you own.
Phil
ps.. there was also a hole in the bolster of the 127UH from 1968- 1969, but the 125OT hadn't been produced yet, making it pretty clear that the knife in question was mistakenly put together during the second production run.
Any other information from you other guys?