This oscillator module is copyrighted "XDS-67". It is composed of resistors, diodes, capacitors, transistors mounted on a heat sink and a transformer. Many inspection stamps on circuit side.
Manufacturer
Scientific Data Systems (SDS)
Identifying Numbers
Other number
112 M
Stamped in black at top edge on circuit side.
Other number
137609D
A printed wiring board number on left side on component side.
Other number
WT10
Printed in white at top of board on component side.