Can anyone help me identify this watch?

Welcome to the forum!
The 145.016 is often called a "soccer timer" as the sub-dials were marked in a pattern suitable for a soccer or football match. There is an excellent write up by Ash on the 145.016 here: https://omegaforums.net/threads/seamaster-soccer-timer-145-016-review.1768/.
Yours looks like the 145.006 but the best thing to do is to have a competent person unscrew the caseback and give us clear, head on pictures of the movement (might be a 321!) and the inside of the caseback which will have the nomenclature you seek.

Do you own the watch? What else can you tell us?

The only way to know for sure is having it opened.

As already noted get clear photos of the inside of the case back and movement, you're going to need them anyway if you plan on selling it.

Don't be stumped, just have a watchmaker unscrew the back for you and all should be revealed.
There is no doubt in my mind that it is not a 145.016 and I am very confident that you have the 145.006 which first came out in 1966.

Please don't wind, clean, polish or do anything else but obtain the pictures! It is a beautiful watch that has some good value, ask Grandpa for a family discount or an advance on your inheritance.

Please commend him on having great taste!
And kudos to you for coming here and doing some homework.

Sad that we have reached that state(sad but true). Which is worse, the evil of the plotter or the naivete' of the victim?

I have good vibes about our new friend, however.
Anyway, I am sure that he will reach 200 posts just asking questions and doing research and when we are through with him...,...

Ok, so now I'm not so darn sure!
Let's get the friggin' caseback off!

I offered my personal IOU and heard crickets.

Seriously, if OP was a sophisticated scammer, the caseback would be off.

I like the member, I feel it may be a lady.

Unless there was something to hide.

Dammit, Fred! You got me questioning.

The stupidity is in not asking.

Please keep us informed, we can be of help.

Hello,
that is a 145.006!