What movement does the Seiko Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition run compared to the Stewart Dawson Royal Marines?

Both watches run automatic movements — the Seiko Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition uses the Seiko 6R35 and the Stewart Dawson Royal Marines uses the Sellita SW200-1.

Side by side

Seiko Prospex Sea 1965 Heritage Diver's Save the Ocean Special EditionvsStewart Dawson Royal Marines

Q: Which is cheaper, the Seiko Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition or the Stewart Dawson Royal Marines?

At MSRP the Seiko Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition is the cheaper of the two at $1,250, against $1,451 for the Stewart Dawson Royal Marines — a $201 gap before any retailer discounting.

Q: Which is bigger, the Seiko Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition or the Stewart Dawson Royal Marines?

The Stewart Dawson Royal Marines wears larger at 42mm versus 40.5mm for the Seiko Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition — a 1.5mm difference across the dial.

Q: Which has better water resistance, the Seiko Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition or the Stewart Dawson Royal Marines?

The Seiko Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition is rated to 200m versus 100m for the Stewart Dawson Royal Marines.

Q: Which has a longer power reserve, the Seiko Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition or the Stewart Dawson Royal Marines?

The Seiko Prospex Sea 1965 Heritage Diver's Save the Ocean Special Edition carries a 70-hour power reserve against 41 hours on the Stewart Dawson Royal Marines.