according to www.petethomas.co.uk/saxophone-serial-numbers.html its from the early '20s
its a true-tone. havent had too much experience with buescher saxes, but ive heard some pretty good things about them. It should be worth repairing. not too familiar with buescher prices, but if you search around on some sites (like saxquest or pmwoodwind.com or ebay) you can get a fairly good idea about the price.