Thoughts on this Vintage Ladies Omega De Ville?

Hi everyone! Hope to get your insight on this piece. I believe it’s a vintage Omega De Ville Manual Wind Gold Over Stainless Steel 24mm. Model Number: 511.0561
It’s being offered to me for around $600. I’ve been searching online for price ranges for this particular piece and I’m getting way too broad of a range. Some as low as $200 and some as high as $650. Just wanted to get your guys’ opinion on this. Looks to be in decent condition but with an aftermarket strap. The shape doesn’t come around too often too!

Thanks everyone. Have a great day

if these ever do sell, the sale price would be closer to your lower estimate.

If you search eBay and look for Ladies Omega De Ville. Number of various models show up

one same as your from Japan for $310. Same in silver case for $250 and that’s only the first page

email sellers and offer a lower price with private auction and see if they bite. Certain women’s models don’t sell that well and some sellers willing to take less to sell them. Smaller profit is better than no profit.