It KILLS me to post this.
I have two SWEET 10 gallon soda kegs bought from a forum member, but I am in so deep with my spending money that I won't be able to use them or do any brewing for like seven months (seriously).
These are the real deal. 10 gallon A&W Rootbeer kegs. I will be getting pics of them soon. The logo painted on the front is the original A&W logo, which they stopped using in the mid 1960's. So these are at least 50 years old. Built like a tank, they are awesome and I don't see any reason why they couldn't be used like any corny keg.
The only thing missing on them is the liquid out post. However, these look to be all standard Firestone fittings, so those can be replaced. I already found the posts for like $14 apiece. I planned on using them for fermenting, so that wasn't a concern for me. The pressure relief is also unlike anything I've seen before. Gaskets are a little different. McMaster to the rescue!
Took a bit of effort to clean one up from the condition they were in when I got them. I wonder what people would offer for them. Serious offers only.