I had an older Pitch guage from another company.
Partly my interest in both this thread - and the Ebay Prather Pitch guages is : I needed to get my hands on a proper Prather do do my Comp props with.
About 6 months ago I purchased one off Ebay after realizing the following :
I wasnt going to get one cheap
No-one was prepared to sell me one Privatly
I couldnt get a Good quality one for less
So now Im the proud owner of a Prather, Ben Franklin and 2 of his brothers helped me pick it out.