Hello all, I am new to the forum and a rookie when it comes to any instrument. I have heard mixed opinions on this one due to the number of valves. Can anyone please tell me what exactly I have here? Engraved into the metal (by hand) is the phrase "property of the US Government" but I very much doubt anyone is missing it. Unfortunately I do not see any manufacturer markings (or perhaps don't know where to look) so any ideas as to who made this as well? Lastly, if I may request, I would also like an estimation of age please. Any feedback would be greatly appreciated and thank you in advance. William Kramer