Honeywell R8184G 1427 Oil Burner Control
actual pictures of the oil burner control: 
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The oil burner control was removed from a working system, we replaced the whole system, and the new boiler came with new oil burner, it was fully tested and works great. anyway if you find any problem with the aquastat, you can return it and I will return your money back(including shipping price).
Protectorelay® Oil Burner Control with 45 seconds lock out timing. Provides automatic, nonrecycling control of an intermittent ignition oil burner system. Controls oil burner, oil valve (if desired) and the ignition transformer in response to a call for heat. Mounts on standard 4 x 4 in. junction box.
more information: http://customer.honeywell.com/techlit/pdf/69-0000s/69-0618f.pdf
Shipping only for U.S.A.
All orders are shipped via USPS and will include a delivery confirmation number (tracking number), so you can locate your order. Please note: USPS delivery numbers are not scanned like UPS and FedEx. items will be shipped in the next day after payment received, we are not responsible for transit times. If there is any dispute please contact us. We try our best to provide excellent customer satisfaction and solve any problems in a timely manner.