Welcome to our little corner of the internet.
The problem with vintage ladies' watches is that they are not hugely collectible is it is hit or miss what you could get for it. Proper auctions (rather than eBay) will give a greater return but then you already know what it will fetch at auction.
I have given a few vintage Omegas as gifts to certain women in my life and the most I have paid for one, prior to servicing, is £200 for an 18 carat Cal.620 with original box and papers, albeit on a strap and I probably over paid as it was a birth year example. Yours is from about 1965.
I hate to say this but you would probably get more for it by selling the movement separately and the case/bracelet for melting - don't forget that a large part of the weight will be in the movement. That Cal. 661 is a scarce beast so it might take a while to sell it for a good price or you might find someone who is desperate for parts quite quickly.
On the whole, women tend to want a watch that looks good so the patina on the dial that appeals to us here, is not so attractive and winding it up before wearing is an unnecessary act - at least that was the consensus on this forum a while back.
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