Can't help ya directly... but I recommend you contact Chuck “Frets” Fayne via his Uke Yak place on FleaMarket Music. Chuck is the expert who can provide a somewhat realistic value, but ya might need to send hm a pic too. Anyway, here's a link: http://www.fleamarketmusic.com/uke-yak/default.asp
Vintage Guitar Price Guide 2010 has the following listing for Favilla baritone ukuleles. It only has a range for excellent condition, i.e., mint is worth more than that range and less than excellent falls below that range. The guide also states that if the wider the range for an excellent condition means the more disputed the value is:
FAVILLA
1890-1973. The small New York City family-owned factory that produced primarily guitars also managed to offer some surprisingly high quality ukes, the best of which rival Martin and Gibson for craftmanship and tone. As a result, Favilla ukuleles are a real value for the money.
Baritone Ukulele
1950's Plain mahogany Exc. Condition low $500 to high 750
elderly.com recently had several Favilla baritones for sale, and they were price varying depenidn on their condition - the highest priced one was around $425 as I recall and was in very good condition and they said it was an excellet player and had a big tone, while the others were like $375 and $275 I think and had varying repairs done or needed some work.