Hi Mark,

My 1966 dated copy of Section 6A of AP1086 gives no information to what aircraft type the ASI would be fitted to.

It’s described as ‘Indicator Airspeed’ with a p/n of KAB.2301W

As it’s got such a low start point and relatively low max speed I’m guessing it maybe helicopter related.

Not much to go on I’m afriad.

Regards
Dave