I have one NOS pair available that no longer have the RCA printing on them, but have the same date and plant codes. I will include a third RCA 6350 that does have the RCA printing, but a different date and plant code. All test new.
The pair come in boxes labeled "Standard Brand" and the single comes in a generic white box.
Price: $20.00 per pair includes the third tube free
Payment: PayPal (add 3%)
Shipping: $6.95 USPS Priority