Hubcap Identification

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Good evening folks. I have a bit of a dilemma. I have a couple of hubcaps that, as near as I can tell, may be the same as what I have seen in a relatively poor picture of a 1929 Towncar. Before I registered, I did a scale drawing of the hubcaps, but once registered, can find no way to attach a jpg file.

Does anyone know of any info available that would be definitive? These have a five bolt pattern, and are 7 1/2" in diameter. The round, 2 1/2" center emblem is held on with one small bolt, attached from the inside, and has overlapping royal blue DB letters in what I would guess is blue enamel with raised edges. The background is a rough stippled texture, similar to something that has been tapped a thousand times with a dull centerpunch, and of a yellow brass color. The emblems may in fact [i:l68irpdn]be[/i:l68irpdn] yellow brass, however I haven't removed them to look. The bolt pattern is very slightly (a few thousandths) over 3 1/2" between adjacent holes, and the holes themselves are a few thousandths over 3/8". The face of the hub sticks out approximately 3" from the faceplate, and the hub extension is about 4" in diameter., with the outermost part of the hub face behind the emblem being 5" in diameter....

To bad I can't post the drawing, as it would be pretty much self explanatory.

I'd appreciate any light you folks might throw on the subject.

Thanks,
Ron