Ah, the black sawcut version, the classic. These started with Delrin sawcut scales, a DuPont material you can check out on the web. That version was made as a contract knife by Camillus up to 1886 when Buck took home its creation. One of situations of the knives before yours that had this Delrin material, was its characteristic to "De-Gas". The knife put in a closed up situation and left untouched for a long period of time would exibit a 'whitish' desposit as the material aged. The current sawcuts are made of Valox and it is not as prone to such effects. You will encounter this in some of the older versions on sale sites. Soap and water and some mineral oil and all will be OK on those old ones.
The scales on your knife are put in place using heat and pressure. The shield is a pillar or metal attached to the liner and helps hold on the scale as it is pressed with force over the pillar during assembly. Look inside your blade well and you will see circles of the scale material. These started as rivets of Valox on the back of the scale that went through holes in the liner and were 'melt' press rivited to hold the scale on also. The other three versions of this knife all have their scales only riveted on in two places with the blue buck emblem glued in a scale surface cut-out. The Chairman and Dymondwood series scales are impregnated stablized wood product and should be tough as nails. The new yellow scaled version is also Valox but only riveted on to the liner. Once in great whiles a stag or jigged bone version appears, not often enough to suit me.
I also continue to campaign to replace or remove the spey blade and put a really nice shaped Warcliff blade in its place. A 303 with clip and warcliff, same end or opposite, I will be happy with the easiest for the factory to do. Good luck with your new knife and as you can see here, there are a number of them in pockets everywhere.
My Survivor Man attitude favors the extra tough construction of the black sawcut version, but it is likely the most costly to assemble. I hope it does not fall out of factory favor. Steel for all versions is Buck 420hc, Bos method treated. Good luck with yours and I bet you will need a second one soon. 300Bucks