Well I might have screwed that up then. I went ahead and bought an F3 mogul before seeing all these posts. The price was reasonable and it had a Samhongsa label under the tender. We'll see how works out. It's totally out of era for my layout planning, but the thought of a little Mogul next to a K4 seemed like a good idea at the time today.
I truly appreciate the feedback! I'll report back as to my findings.