This vintage Casella/London thermograph weather station is a must-have for any collector of scientific instruments. The serial number 21837 adds to its charm and makes it a unique addition to your collection. Although the item is untested, it is sure to be a conversation starter and a great conversation piece. The brand of this thermograph is Casella/London, and it falls under the categories of barometers, scientific instruments, and science & medicine (1930-now). This item is a great find for anyone interested in collecting vintage scientific instruments and adding a touch of history to their collection.