Yes, definitely Non-Regal at those weights. It is actually very difficult to find a Regal 1775 - I read somewhere that by 1799, when the new Halfpenny came out, up to 90% of the copper coins in circulation were contemporary counterfeits.
Here is a 1774 Non Regal I picked up the other day. Looks to be very similar design and may be from the same counterfeiting operation. This one weighs 8.34g. (In the UK both gram and gramme are acceptable but I think American culture and Texting is making the former more normal now. I dodge the question by using "g".)
