I thought it could be the Panagor 135mm 'close focus' F2.8
If so this was made by Komine and branded under a few other labels such as Elicar. It is supposed to be a pretty decent older lens.
Then I checked Google:
Sunagor - Wikipedia, the free encyclopedia
There does not seem to be any association with Komine or the the other labels and there also seems to be a few reprints of Sunagor manuals on other info on the name in Google.
There are a couple of Sunagor 135s available now on Fleabay with pics, two PK mounts.