Perry, The 3010A prefix identifies that date it was made. It should also have a 10811A marking. The resistor value is for applications needing precise EFC. Usually found in HP 5065A, 5061A, and 5061B. If it also has a 60109 marking it has slightly better short term stability at one Tau. Specs are otherwise the same as any 10811A. There is no outer oven! Since the design is a complete departure from the original 105 oscillator it makes sense they issued a new part ID. The 10811A started to go into the 105A and the 5061A and 5065A after the 105 style oscillator was discontinued. Cheers, Corby
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