I agree with you on this, PLG. There is a lot of talent at work here.
On Mangaupdates it is dated 1992, but I can't be sure it's the real date:
judging by style and colors, I'd say it's more mid-Eighties.
By the way, this manga is one of the reasons I'm not too sad for Batoto's closing:
I was very pissed off when a retarded mod removed it just because he didn't like it,
especially considering this is not scanlated by a site-equipped group, but by a 4chan individual,
and it's not that easy to find good quality copies to download