An "identify that component" challenge:
28-pin 0.3" DIP IC, possibly some sort of microcontroller.
Markings have been deliberately etched off.
It's from a cheap eBay-generic serial CNC handwheel pulse generator - maybe something old, or something obscure from China.
Pin 4: UART RXD
Pin 5: UART TXD
Pin 6: 11.0592 MHz crystal, plus typical crystal load capacitors.
Pin 7: Other side of the crystal oscillator.
Pin 14: Ground
Pin 28: +5V supply.
Any takers?