[morzh]

To have some idea, I (and others) have 87, 111 and 112 restoration, which are the radios from the same period, with often the same or similar cabinets and grillcloth.
I never measured them, but yes they are shallower, or at least look shallower than the later chassis.

This is the 111. It was the earliest superhet by Philco, in the same cabinets and with the same type chassis.
https://philcoradio.com/phorum/showthrea...Philco+111

This is the Philco 112, same radio as 111, but with electrolytics instead of the bug can.
https://philcoradio.com/phorum/showthrea...Philco+112

This is Philco 86. It is a TRF, same as the current 96, but with more tubes: an extra audio stage plus it is a triode-based, and so would require neutralizing during the alignment.
https://philcoradio.com/phorum/showthrea...=Philco+86