I'll take a stab at this just based on your description. Yes, it is vintage. Ludwig Standard was Ludwigs "economy" line that was introduced in the early 1070's. They used some non-traditional finishes like the "swirl" that you mentioned. If I remember right they used a bit less expensive hardware than their regular line. I think the shells were still Ludwig manufactured. It was the Ludwig attempt to offset the import of less expensive kits from Asia. Actually they were not bad drums at all. As to value, I guess that's up for speculation but since you don't see that many around it is relatively rare.

I can't give an exact number but i've seen Ludwig Standards go for a good $$ on ebay.Best bet is to peruse ebay and see if you can't find a snare similar to yours in terms of hardware,condition,etc and see whats its going for. Its worth atleast $100 off the top of my head.