In A Nutshell Antiques and Interiors has dated this piece to the 1930s.
There is a ring on the top of the case for hanging the barometer on the wall.

The barometer has been painted all over with a dark green paint which looks like it could be military. There are also numbers II 101 on the back beside a military style arrow. The paint has chipped in places and the barometer itself looks to be brass below.

It is in good condition for its age. The glass is clean and has no major surface scratches. The face has some age spots on it and there is some wear around the outer case but nothing untoward and it displays well. It appears to be in working order. I've done 'the bag test' and the pointer certainly moves as it should do.

Approximate Measurements :
Diameter : 5 1/2" / 14cm
Depth : 2 1/2" / 6cm
The best description comes from the photos so please look at them all carefully and if you have any questions just ask.
Tracked UK Delivery £8
In A Nutshell Antiques and Interiors has dated this piece to the 1930s.
Selling good quality victorian, georgian and earlier furniture, accessories & decorative items. Ashburton, devon. LAPADA member
You can view the stock and full dealer information on the In A Nutshell Antiques and Interiors Profile Page
In A Nutshell Antiques and Interiors is a registered member of LAPADA CINOA