Any Barometer experts? Help with Antique U.S. Signal Service England

[NWpickin]

Hey guys I have had several Antique barometers and shipsbells over the years and somewhat familiar but this has me stumped... I have found a few similar online but none that are exactly the same... Most recently one from the early 1900's sold on eBay for $175... but I suspect mine is older..... I'm guessing late 1800's?

Are there any experts out there that know anything about this and it's rarity?

Details:
-U.S. Signal Service with porcelain dial (I'm guessing)
-Made in England
-Measures about 2 1/4"tall and 5 1/4 wide
-Made out of brass or brass plated

Any help would be greatly appreciated.

 

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