Hi Czingy,
Can't cite the source but the following description was shared with me when attempting to date some of my Buckmasters.
"In 1986 the knives were stamped BUCK, 184<, U.S.A., PAT. PEND. This is also the time that Buck switched to forged blanks instead of conventional blanks. The only way to distinguish a forged blank from a conventional is to look at the end of the tang, which is not possible on an assembled knife.
In mid 1986, records show a change to adding the rope cutting serrations after bead blasting. They would have a ground finish whereas the rest of the knife, excluding the edge, would have a bead blasted finish. The 184BK was added in September 1986. This knife was identical in all aspects to the previous version except for a black oxide finish.
Effective November 1986, all Buckmasters were identified with U.S. Pat. #4622707. This identification was done by means of an adhesive sticker placed on the box. In Early 1987, this same designation was forged into the relief groove in the blade. Buckmasters from this point on did not have a date code. "
In your description were you indicating your knife has both the Silva compass in it's cloth pouch as well as a compass in the thread in pommel? That would make it a rare beast. Enjoy
Capt Bruce