The LTW455E is a ceramic filter, which gives the radio its selectivity, the filter is in the second IF stage at 455khz.
The input frequency 173.75 Mhz is converted to the first IF of 10.7Mhz by mixing with the 5th harmonic of the 32.61Mhz crystal.
The first IF 10.7 Mhz is converted to the second IF 455khz by mixing with the 10.245Mhz crystal.
To recieve 152.275 Mhz you will need to change the 32.61 Mhz crystal and retune the RF circuits, the two "cans" side by side at the top of the photo.
Re-tuning will be VERY difficult without a signal generator of some sort.
As for the new crystal frequency, there are two possibilities.
Keep with the existing "low side injection" where
F_crystal = (F_recieve -10.7)/5
giving a new crystal frequency of 28.315 Mhz.
Or, change to "high side injection" where
F_crystal = (F_recieve +10.7)/5
giving a new crystal frequency of 32.595 Mhz.
In this case high side injection has the advantage that the oscillator circuits are running at nearly the same frequency and will not need any adjustment.
JimB