From what I have seen about Miraphone their engravings usually are Spartan, which is OK with me. In the German market they fairly often are found with additional engravings telling the specific retailer of the original sale. Today I found a rare sample of an elaborate Miraphone engraving. Not a tuba, but still a low brass:
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0630207762
Klaus (not at all involved with this auction)