I would buy it if you can. Committee cornets are well thought of by many, including me. My dad bought me a new to start out on in 8th grade in 1955 and I played until I got a K-mod trumpet for college in 60.
Not sure how much they are worth in comparison to trumpets, but probably a bit less. You might do an advanced search on ebay for completed auctions to see what turns up.
I wish I had the chance to get one again, for nostalgia purposes if nothing else. Apparently it worked ok for me, but I can't recall the actual sound, of course.
Maybe someone who has one or played one recently will chime in.
Welcome to the forum.
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Dave Rafferty
07 Barrington Trumpet, 1972 Reynolds Medalist
55 Besson 8-10 trumpet
55 Roth by Reynolds Cornet
73 Olds Ambassador Cornet
30's Czech small bore Trumpet
Getzen 80 cornet, 33 American Standard cornet
66 Olds Ambassador Trumpet
www.kalamazooconcertband.org