Hi Jim - I have had a Hamilton and replaced it with a PZL.
The Hamilton is, because of its design, very sensitive to
pitch attitude, and consequently quite inaccurate. This is
especially true at higher lattitudes with steeper dip. The
problem is that mechanically the sensing element can't
really stay level.

Pick a point on the horizon heading East or West. Note
the exact compass reading at 45 knots. Now stabilize the
airspeed at 110 knots and see what the compass reads.

It does look nice though !
Best Regards, Dave