Diamond? You’re serious? I had no idea Diamond ever did anything SP! This blows my mind as much as the time I found an early Goodtimes copy of Alice Sweet Alice that was SP (and probably weighed as much as a half-dozen ordinary LP-mode GT tapes combined).
I just assumed you found the Anchor Bay SP version, the fact that it was from DEC just amazes me…
I bought it before I got the Anchor Bay VHS EP set that I ended up replacing with the SP set. I was at a local collectible store and bought it for like $7.00 because I was trying to snag a Godzilla 1985 VHS that was on hold for another customer who hadn’t come in for it yet. I did some research and found out from a fellow collector that he has the same Diamond release and it is in fact, SP mode, circa 1991. Probably a rarity of sorts, especially for that time frame. Fact is, I got lucky, and didn’t know it until afterwards, LOL.