This watch looks great.
It's most likely a 70's reference 145.022 (-74, -76, -78) and it's not a step dial, as far as I can see.
Some experts here will be able to tell you more.
There are many transitional models from the period and many options that parts might have been swapped. So the only way to find out the truth about this watch is to have it opened and see what's engraved inside the caseback and on the movement.
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