[Chuck Schwark]

Philco's lines of test equipent over the years, I believe, were primarily intended for Philco Dealership repair deptartments and independent Philco Authorized Service shops of the day.
They were generally not available to the public, so they would seem rare, I'd think. Many of the smaller, less used instruments probably had a "shorter" lifetime and did not survive land-fills, like the more universal test generators and versatile multimeters that are pretty easy to spot nowadays.

Chuck