Spirit of Olympics, 1996: issued on 25 May or 25 June?

I've been checking the two Spirit of Olympics stamps of 1996 (₹5 each, the Marble Stadium in Athens and the Olympic torch) and I can't settle the date. India Post's list of stamps says 25 May 1996, but several stamp websites and the catalogues say 25 June, and I haven't found the brochure or a dated cover. For now I've gone with India Post's list. Does anyone have a first day cover, a special cover or the brochure for this issue? The date on the cancellation would settle it. A photo would be wonderful. The other stamp of the pair is here: https://thephilatelist.in/stamps/spirit-of-olympics-olympic-torch/