Temperature Controlled
Transistorized
Crystal Oscillator
Supply 30V.DC (30 blacked out replaced with 15)  500ohm Load
Freq. 100Kc  107-1 Model
/script-on Northern Engineering Laboratories /script-off
INC.
Burlington Wisconsin
Ser. 520
Voltage   OVEN TYPE    Temperature
 117V.AC   NE-100T0        70 C


Alum can 3" diameter 3 7/8" tall

Octal tube socket 
3 mounting studs
1/4 " adj hole in top

Both transistors (now 2n2222A) and some resistors have been replaced before I received it. Probably the reason the supply voltage was changed from 30 to 15 volts.