Sadly, someone just tore this piece off of a wrapper which reduces the value as a piece of postal history - had they been on the full wrapper that would have enhanced their value. And, this being from a rear echelon supply office to an even more rear echelon supply office suring peacetime that hurts the value. And finally, used 834s in nice condition with a nice postal cancellations can easily be had on eBay
for about $1. The three 834s on this piece were cancelled by a clerk who couldn't bother finding a cancel device and used some kind of pen or crayon which hurts their value to the point that this would be hard to sell.