It is an old freeflight from the 40s but depending on the collector it may be worth about $100.00 on the open market, that's just a guess, maybe a bit more with the original bottles inside and all the items? I have run across a number of the really old 1/2A kits and made templates of the parts then built the plane with my own wood keeping the kit then giving the original kit to a collector. I like to build them from the templates and then adapt them as two channel electrics. Just a fun thing to do, I hate to destroy the original by building it, they are fun just to see how it was done in the days gone by. It's a keeper but you can use your scanner to make templates and have a copy of the plans made. The wood was silk screened then we had to use a razor blade and sanding paper to make all the parts before building. Pain in the butt but it's how things were done. There were a couple types of timers for freeflight. Some had a battery and others had a plunger that would cut off the fuel flow. I started building in 1956 and about half of my planes were the silk screen type and the other half were die cut, well, sort of die cut. About half way through the wood.