Anyone here familiar with these signs and what something like this is worth?

It is 30" x 30" and double sided. I haven't been able to find anything else like it. Any way to authenticate it or accurately date it?

My first thought made in India

Ditto here Tankar.......

Anything particular that lends to it? You may be right, I just haven't seen anything like it (which may be a sign itself), so I do not know what to compare it to or look for

To me, the lettering and logo don't look like anything Shell Oil has used in the past. Makes me suspect the sign.

Shell logos and signs:
https://www.oldgas.com/forum/ubbthreads.php?ubb=showflat&Number=80917

I'm not an expert. You can have a sign authenticated or appraised by experts for a fee at:
http://pcmpublishing.com/shop/products.php?cat=11
https://matthewstac.com/home/

I have seen European Shell signs that used this lettering. I don't know if it's real or not, but I have seen Shell signs that looked similar in the European market.

Sloppy.

This::

This picture is from http://www.vintageadbrowser.com/oil-and-gas-ads-misc-years/2. Apparently the site is a collection of old ads from all over the world. The site doesn't state where this sign is from.