Need help identifying a mask

When I first got into this hobby I didn’t know much about masks, and I’m no expert on them to this day. I bought this mask several years ago off of eBay but I really don’t know what I have. It used to have writing on the inside but over time it has faded away. The only thing I can faintly see is “H2”. Anybody out there care to take a guess at what this may be?

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Looks kinda like one of the many nightmare mould derivatives. This definitely looks like something from Terry Lambert from years ago, the yellowing latex leads me to believe that.

Definitely significant aging. Not sure on who tbh

Looks like an old Nightmare. Not sure who did it though- I remember a guy going by username ColdVenom something having done a nightmare conversion back in the day that this could be maybe?