Mk 1 boost gauge

I have recently acquired what I think is a MK I boost gauge, however there are no military markings on it, nor does it say boost on the dial, but everything else about it looks right.

Here is a photo of it, & also a picture of a MK Ia Boost guage.

Can anyone tell me if this is what I believe it to be “or not”, & if there are any more of them about ?

Bob T.

Photo of Bristol Bulldog I from 1929 shows what looks like your boost gauge here :

http://www.aviationarchive.org.uk/Gpages/html/G3251.html

Given that AP 1275 1930 clearly identifies the Mk1A as shown in your B&W photograph then it seems you have a pre Mk 1A boost gauge shown in situ in a Doggy in 1929, so I guess it’s Mk I.

If you trace your Hawker panel then I will tell you where I think some more of them will be !