Hi Jay,
I note some typos in what I wrote yesterday - sorry - and the little aside on Polish practice during the time of the Polish Commonwealth really wasn't relevant to anything we were talking about either, so again, sorry for interposing it. A little flourish of mine, if you will.
What I can add today is another reference for you on heraldry which provides a useful world view and is generalist in nature and not too detailed. It's also of pocket-book size and by an author I've referred you to before. Its actually a first class reference guide if you can still find it somewhere:
Carl Alexander von Volborth: "Heraldry of the World", Blandford Press Ltd, London, 1973, ISBN 0 7137 0647 3. (Originally published in Denmark as 'Alverdens Heraldik i Farver by Politikens Forlag)
I don't agree with you that the arms (do you mean those assumed longest ago?) are to be esteemed more highly than any others, including those assumed later on or those granted by some historical circumstance later. The reason I disagree is because arms, assumed or otherwise, tell a story about the person who assumed them, or the family that still holds them, or the person to whom they were granted, and those arms only make full sense when seen in the context of all we know about the person who assumed them or to whom they were granted. It's the historic and, if you like, also the genealogical, link between the two that enhances both, the heraldry and the genealogy. If you were to list just family members in sequence one after the other as in a succession of rote dates as in school, it would quickly become very boring: but if we can discover a little bit more about each individual, what they did, where they lived, what sort of achievements they had in life, if we can 'colour them in' as it were, they become much more three-dimensional and we can feel much more truly linked to our past.
It just so happens that in centuries past the system of public rewards took certain forms expressed through heraldry and sometimes through elevations to the nobility. Although this is a system we no longer maintain, it behoves us to learn how to read and interpret these expressions, in this case heraldry, not only in terms of our thinking today but also, to the extent we can, in terms of the thinking of contemporaries of the person we might be studying at a given moment in time.
To put all this another way, we can look at several examples in Baltic German heraldry for the very oldest of assumed arms and I refer you here to the von Wrangell, the von Fersen, the von Stackelberg or the von Taube families. In each case, beautifully simply elegant arms with just one charge; the Wrangell - silver with a black fess hatched on the topside only; the Fersen - blue, a winged fish salient with a golden ring in its mouth; the Stackelberg - gold, twin brown tree stumps rising from a green mound, each each bearing one green leaf; the Taube - gold, a tree stump plucked out by its roots bearing 2 green leaves. Over the course of time and specifically in the 17 and 18th centuries, several lines of each of these families independently became Swedish 'friherrer' (barons) and were each granted distinctive, augmented coats of arms. Several also achieved the rank of Swedish counts. During the Russian period, the rank of baron was extended to all the other lines of the each family, not just the lines that had been expressly elevated to that rank in the past, and it was these other lines that continued to use the old 'assumed' versions of their family's arms, just as they had always done. Now, it is and remains a question of personal taste and aesthetics as to whether any of the descendants of those who held Swedish titles would choose to use the Swedish coats of arms that had been granted to their ancestors or whether they would prefer to revert to their ancestral assumed arms, simply because they are so simple and elegant. This is a choice for them as it has always been and as I have always said. What I may not have said is that the arms granted by the monarch to their ancestor would have always also featured their own family arms in some way, so that this aspect was never ignored but always also there.
What I come back to wanting to say is that even someone today assuming arms would want those arms to say something about them. Arms have always been an extension of the individual who assumed them historically or to whom they were granted, and they really only make sense if seen in that way. They don't makle sense if viewed like a piece of personal jewellery that can be donned or doffed at personal whim. Arms are a thing you take on for the long term and hand down to your successors. This is how its always worked and been understood.
For those who don't have a coat of arms, assuming one these days isn't a problem provided you play be the rules of heraldry, and you'd be setting a tradition, something for your descendants to inherit. We all have to begin sometime and I see no problem with that.
Best wishes. Jens