Joe,
I had Solingens made in the late 1980's up to...and through the mid 1990's. They were all CDT's, just as this appears to be, verses full, exposed models of the earlier times. The baby dot sheath is also a Sullivans so the dating of late 80's to early 90's also holds true. I think the sheaths were pewter "logo" snapped soon after that.
Also: No earlier examples (at least none I have ever seen) were made with "slotted" Westinghouse, "Old Yeller".
Best, Capt. Chris