On the consistency of different well-polished astronomy software I have purchased a custom wedding band from a seller that claims the ring will show the constellations visible at the horizon on a specific date at a certain date and time. 

However, I have fired up Stellarium and set it up to look at a specific example shown in the product page - and I cannot find any set of parameters which looks like it: Jupiter's not in the right place, some constellations are under the horizon (Virgo, Libra, Leo), some others very high in the sky (Andromeda, Perseus)... Although it's the first time I use Stellarium, I don't see how I could make a mistake:


Location set to London Bridge (even the preset London to be sure)
Date and time set just like in the example (double-checked 5 times)
Cylindrical projection (tried all of them though), offset -30%
FoV 210° (to have the 360° mapped to the entire screen - I have
absolutely no idea why 180° does not work)
Elevation lines horizontal (although I tried moving around to align everything like in the pictures for every projection method - in vain)


Here is the example:


Am I missing something, or is their sky map wrong? If yes, is it possible that two pieces of well-polished software like Stellarium and this one (looks just as good as Stellarium) have different star locations? How come (isn't there a standard star almanach?)?
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.