I have two crystals for the pro 1, which was made by GRE japan. They are VHF high, pretty sure 154.845 and 156.03.. grew up in the Philly area but lived on Long Island, New York for 16 years and Suffolk County Police used to be on VHF repeaters. I've since moved back to the Philly area.
That was a great slide rule dial receiver. The problem with those crystals, as you know, is the size, they're huge. It was unique to have two Crystal controlled channels on a tunable monitor in the 60s. I still have the receiver in pristine condition, heavy steel, very sturdy.
Keep searching the internet, you might get lucky.. Bob.