The OVD is not complete and each reference has multiple dial variations. Also, the OVD generally has an extra zero after the ".", so that's normal. However, the watch appears to be a 166.070, not 166.040, so you seem a bit confused.
Anyway, based on those photos, I don't see any obvious problems with the watch, and $500 USD doesn't sound outrageous to me. So if you like it and feel comfortable with the seller, then buy it. In some ways, Geneve models were entry-level pieces because they generally had basic case designs. However, they often had excellent movements and attractive dials. It's mainly a matter of personal taste and what appeals to you.
As mentioned above, by doing more research, you will eventually develop enough knowledge to be confident in purchasing online. You had some push-back in this thread, because this is a community of collectors, we are not paid to evaluate watches and give advice to strangers. So people will be more likely to help if you engage with the community, introduce yourself, and develop some relationships.
There are also watches for sale by OF members in the Private Sales section. Sometimes they are very nice watches because many members are serious collectors, and they are letting go their own watches. You can also research the sellers in the SELLER PROFILES sub-forum.
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