On the consistency of different well-polished astronomy software
If you set the date to 2018-04-06, Stellarium shows the Moon and planets in positions matching the example image.
Any good planetarium software should produce a similar result.



Most likely the vendor cut and pasted two screenshots (note the seam) for April 2018, overlaid "January 1973," and hoped customers would not check.
Perhaps you could ask them to send you an image for approval before printing the ring.