It's a crapshoot.  It probably has a tube which is compatible with the CR23 adapter...or, perhaps on another run of the same TV they used a tube which has a CR31, instead.  
Is the TV free?  Then just get it.    If they're asking big bucks for it, forget that TV altogether.  Ask on Craigslist for anyone that has a 19" TV.  A lot of people have replaced their tube TVs with flatscreens, and are keeping the old one, either because of the recycling cost, or "just in case".