Looking for info: Career, Shin Sung, Sam Yang, Sumatra, etc.

Merry Christmas all!

I've been looking for info on the history of and models of airguns from this family. Can anyone provide any direction to information that might help me piece together where these guns fit in the timeline of airgunning? If nothing else than just my piece of mind, I'd like to try to compile some sort of reference on these guns as I enjoy them so much. Any info would be of great help, Thank you all.
 
Tom Gaylord tested and wrote about the C707 in one of his earlier issues of The Airgun Letter. It was a gold side version which were the first that Davis Scweisinger imported in the early 90s, I believe. His business was Air Rifle Specialists. I've not seen anything from that era on the Sam Yang Golden Saver 7000, which I've had 2 of or the Sumatra which I also have. I purchased my Sam Yangs around 2000 and my Sumatra shortly after. I will see if I can find the Airgun Letter with the test in it. You might also pose the question to Tom, who writes a blog for PA.

Bob
 
Contact Davis, seems to still be alive and would be the expert in the originals.

Would be worth documenting as it's nearly lost history now and I've owned em.

Other than the rather rare daystate 13mm the Farco (Davis) was the first big-bore imported into the US, Co2 rig that when filled with 1,500psi (dont do it) easily killed an Fla. Hog. And the race was on.

Also some other Korean variants (farco was PI). I'm not even sure about the "golden Saver" but the 505 was "korean" assembled in TX along with 3 others I dont recall. 

And the "Big-Bore 44" was a custom run/order spec'ed by 1 man in the U.S. (and they blew the specs on the 1st batch) and was almost instantly relabeled and............

Just some odd's & ends info from the internet:

https://fokkemol.weebly.com/korean-airguns.html

The .20 cal. Sumatra was
 
Well, Tom published his article in Dec 1995 and made reference to seeing them at an airgun show in July of that year. He also mentioned John Burroughs, who was a dealer/tuner in CA and referenced him having already developed a set of modifications for it. IIRC, Davis was first to import them and maybe for a while before John got started on them. A guy named Jack Lewis in CA was also instrumental in developing the modifications. In 1999 I'm pretty sure, I was able to visit with Alan Z when he lived north of Chicago. He showed me a C707 that he had tuned and cut the front sight off and installed one of his super moderators. The trigger was only a couple of ozs and ir made a light click.... then WHACK when he would shoot something. It was impressive!!! I really like the match peeps that came on the early ones, so didn't care for him cutting them off. He also showed me a drawer full of valve stems from ones he had worked on. I didn't know there were that many sold....lol.

Just a little more for you.

Bob