New member! Can you help re this Seamaster 600? #2

Hello, new member here again.

My friend has inherited a couple of Omegas from her recently-deceased mother. She has no information about where and who the watches came from - they’ve been lying around the house not very well cared-for. I have posted one of them in a separate thread (see my profile) but I’m wondering if anyone can help with info on this Seamaster 600.

Unfortunately I photographed them before reading of the forum's request for measurement and a shot of the crown, and the watches are now back with my friend. But if you can give me a rough idea of the year, model/reference, rarity, vague idea of value etc that would be really appreciated. Many thanks in advance.

That looks like a 136.011 with 611 caliber (manual wind). These usually date to the mid-60s. Not too rare. The price can be anywhere from $500 to $800 depending on the condition.

Wonderful, thanks both of you!